diff --git a/api/build.gradle b/api/build.gradle
index 4912bfbb..284b8025 100644
--- a/api/build.gradle
+++ b/api/build.gradle
@@ -3,12 +3,13 @@ test {
 }
 
 dependencies {
-    compile project(':model')
-    compile project(':security')
+    implementation project(':model')
+    implementation project(':security')
     implementation 'com.fasterxml.jackson.core:jackson-core'
     implementation 'com.fasterxml.jackson.core:jackson-databind'
     implementation 'com.fasterxml.jackson.core:jackson-annotations'
     implementation 'com.fasterxml.jackson.datatype:jackson-datatype-jdk8'
+    implementation 'com.fasterxml.jackson.datatype:jackson-datatype-jsr310'
     implementation 'org.springframework.boot:spring-boot-starter-web'
     implementation 'org.springframework:spring-context'
     implementation 'org.slf4j:slf4j-api'
@@ -22,4 +23,4 @@ dependencies {
     testImplementation 'org.junit.platform:junit-platform-suite-api'
     testImplementation 'org.springframework.boot:spring-boot-test'
     testImplementation 'org.springframework.boot:spring-boot-starter-test'
-}
\ No newline at end of file
+}
diff --git a/api/src/main/java/com/coinbase/exchange/api/accounts/Account.java b/api/src/main/java/com/coinbase/exchange/api/accounts/Account.java
index 5ec5d310..a994b9f7 100644
--- a/api/src/main/java/com/coinbase/exchange/api/accounts/Account.java
+++ b/api/src/main/java/com/coinbase/exchange/api/accounts/Account.java
@@ -80,4 +80,16 @@ public String getProfile_id() {
     public void setProfile_id(String profile_id) {
         this.profile_id = profile_id;
     }
+
+    @Override
+    public String toString() {
+        return "Account{"
+                + "id='" + id + '\''
+                + ", currency='" + currency + '\''
+                + ", balance=" + balance
+                + ", available=" + available
+                + ", hold=" + hold
+                + ", profile_id='" + profile_id + '\''
+                + '}';
+    }
 }
diff --git a/api/src/main/java/com/coinbase/exchange/api/accounts/AccountHistory.java b/api/src/main/java/com/coinbase/exchange/api/accounts/AccountHistory.java
index 186ce6bc..dc8efbe1 100644
--- a/api/src/main/java/com/coinbase/exchange/api/accounts/AccountHistory.java
+++ b/api/src/main/java/com/coinbase/exchange/api/accounts/AccountHistory.java
@@ -64,4 +64,16 @@ public Detail getDetail() {
     public void setDetail(Detail detail) {
         this.detail = detail;
     }
+
+    @Override
+    public String toString() {
+        return "AccountHistory{"
+                + "id=" + id
+                + ", created_at='" + created_at + '\''
+                + ", amount=" + amount
+                + ", balance=" + balance
+                + ", type='" + type + '\''
+                + ", detail=" + detail
+                + '}';
+    }
 }
diff --git a/api/src/main/java/com/coinbase/exchange/api/accounts/AccountService.java b/api/src/main/java/com/coinbase/exchange/api/accounts/AccountService.java
index 534407f9..962c5d55 100644
--- a/api/src/main/java/com/coinbase/exchange/api/accounts/AccountService.java
+++ b/api/src/main/java/com/coinbase/exchange/api/accounts/AccountService.java
@@ -1,5 +1,6 @@
 package com.coinbase.exchange.api.accounts;
 
+import com.coinbase.exchange.api.exchange.CoinbaseExchangeException;
 import com.coinbase.exchange.model.Hold;
 import com.coinbase.exchange.api.exchange.CoinbaseExchange;
 import org.springframework.core.ParameterizedTypeReference;
@@ -19,15 +20,15 @@ public AccountService(final CoinbaseExchange exchange) {
 
     public static final String ACCOUNTS_ENDPOINT = "/accounts";
 
-    public List<Account> getAccounts(){
+    public List<Account> getAccounts() throws CoinbaseExchangeException {
         return exchange.getAsList(ACCOUNTS_ENDPOINT, new ParameterizedTypeReference<Account[]>(){});
     }
 
-    public Account getAccount(String id) {
+    public Account getAccount(String id) throws CoinbaseExchangeException {
         return exchange.get(ACCOUNTS_ENDPOINT + "/" + id, new ParameterizedTypeReference<Account>() {});
     }
 
-    public List<AccountHistory> getAccountHistory(String accountId) {
+    public List<AccountHistory> getAccountHistory(String accountId) throws CoinbaseExchangeException {
         String accountHistoryEndpoint = ACCOUNTS_ENDPOINT + "/" + accountId + "/ledger";
         return exchange.getAsList(accountHistoryEndpoint, new ParameterizedTypeReference<AccountHistory[]>(){});
     }
@@ -35,7 +36,7 @@ public List<AccountHistory> getAccountHistory(String accountId) {
     public List<AccountHistory> getPagedAccountHistory(String accountId,
                                                        String beforeOrAfter,
                                                        Integer pageNumber,
-                                                       Integer limit) {
+                                                       Integer limit) throws CoinbaseExchangeException {
 
         String accountHistoryEndpoint = ACCOUNTS_ENDPOINT + "/" + accountId + "/ledger";
         return exchange.pagedGetAsList(accountHistoryEndpoint,
@@ -45,7 +46,7 @@ public List<AccountHistory> getPagedAccountHistory(String accountId,
                 limit);
     }
 
-    public List<Hold> getHolds(String accountId) {
+    public List<Hold> getHolds(String accountId) throws CoinbaseExchangeException {
         String holdsEndpoint = ACCOUNTS_ENDPOINT + "/" + accountId + "/holds";
         return exchange.getAsList(holdsEndpoint, new ParameterizedTypeReference<Hold[]>(){});
     }
@@ -53,7 +54,7 @@ public List<Hold> getHolds(String accountId) {
     public List<Hold> getPagedHolds(String accountId,
                                     String beforeOrAfter,
                                     Integer pageNumber,
-                                    Integer limit) {
+                                    Integer limit) throws CoinbaseExchangeException {
         String holdsEndpoint = ACCOUNTS_ENDPOINT + "/" + accountId + "/holds";
         return exchange.pagedGetAsList(holdsEndpoint,
                 new ParameterizedTypeReference<Hold[]>(){},
diff --git a/api/src/main/java/com/coinbase/exchange/api/deposits/DepositService.java b/api/src/main/java/com/coinbase/exchange/api/deposits/DepositService.java
index bf87ba2d..7f142160 100644
--- a/api/src/main/java/com/coinbase/exchange/api/deposits/DepositService.java
+++ b/api/src/main/java/com/coinbase/exchange/api/deposits/DepositService.java
@@ -1,5 +1,6 @@
 package com.coinbase.exchange.api.deposits;
 
+import com.coinbase.exchange.api.exchange.CoinbaseExchangeException;
 import com.coinbase.exchange.model.CoinbasePaymentRequest;
 import com.coinbase.exchange.model.PaymentResponse;
 import com.coinbase.exchange.api.exchange.CoinbaseExchange;
@@ -28,7 +29,8 @@ public DepositService(final CoinbaseExchange exchange) {
      * @param paymentMethodId
      * @return PaymentResponse
      */
-    public PaymentResponse depositViaPaymentMethod(BigDecimal amount, String currency, final String paymentMethodId) {
+    public PaymentResponse depositViaPaymentMethod(BigDecimal amount, String currency, final String paymentMethodId)
+            throws CoinbaseExchangeException {
         CoinbasePaymentRequest coinbasePaymentRequest = new CoinbasePaymentRequest(amount, currency, paymentMethodId);
         return exchange.post(DEPOSIT_ENDPOINT + PAYMENTS,
                 new ParameterizedTypeReference<PaymentResponse>(){},
@@ -41,7 +43,8 @@ public PaymentResponse depositViaPaymentMethod(BigDecimal amount, String currenc
      * @param coinbaseAccountId
      * @return PaymentResponse
      */
-    public PaymentResponse depositViaCoinbase(BigDecimal amount, String currency, String coinbaseAccountId) {
+    public PaymentResponse depositViaCoinbase(BigDecimal amount, String currency, String coinbaseAccountId)
+            throws CoinbaseExchangeException {
         CoinbasePaymentRequest coinbasePaymentRequest = new CoinbasePaymentRequest(amount, currency, coinbaseAccountId);
         return exchange.post(DEPOSIT_ENDPOINT + COINBASE_PAYMENT,
                 new ParameterizedTypeReference<PaymentResponse>(){},
diff --git a/api/src/main/java/com/coinbase/exchange/api/exchange/CoinbaseExchange.java b/api/src/main/java/com/coinbase/exchange/api/exchange/CoinbaseExchange.java
index 892f3397..e42b7e78 100644
--- a/api/src/main/java/com/coinbase/exchange/api/exchange/CoinbaseExchange.java
+++ b/api/src/main/java/com/coinbase/exchange/api/exchange/CoinbaseExchange.java
@@ -8,11 +8,24 @@
 public interface CoinbaseExchange {
 
     String getBaseUrl();
+
     <R> HttpEntity<String> securityHeaders(String endpoint, String method, String body);
-    <T> T get(String endpoint, ParameterizedTypeReference<T> type);
-    <T> T pagedGet(String endpoint, ParameterizedTypeReference<T> responseType, String beforeOrAfter, Integer pageNumber, Integer limit);
-    <T> List<T> getAsList(String endpoint, ParameterizedTypeReference<T[]> type);
-    <T> List<T> pagedGetAsList(String endpoint, ParameterizedTypeReference<T[]> responseType, String beforeOrAfter, Integer pageNumber, Integer limit);
-    <T, R> T post(String endpoint, ParameterizedTypeReference<T> type, R jsonObject);
-    <T> T delete(String endpoint, ParameterizedTypeReference<T> type);
+
+    <T> T get(String endpoint, ParameterizedTypeReference<T> type) throws CoinbaseExchangeException;
+
+    <T> T pagedGet(
+            String endpoint, ParameterizedTypeReference<T> responseType, String beforeOrAfter, Integer pageNumber,
+            Integer limit
+    ) throws CoinbaseExchangeException;
+
+    <T> List<T> getAsList(String endpoint, ParameterizedTypeReference<T[]> type) throws CoinbaseExchangeException;
+
+    <T> List<T> pagedGetAsList(
+            String endpoint, ParameterizedTypeReference<T[]> responseType, String beforeOrAfter, Integer pageNumber,
+            Integer limit
+    ) throws CoinbaseExchangeException;
+
+    <T, R> T post(String endpoint, ParameterizedTypeReference<T> type, R jsonObject) throws CoinbaseExchangeException;
+
+    <T> T delete(String endpoint, ParameterizedTypeReference<T> type) throws CoinbaseExchangeException;
 }
diff --git a/api/src/main/java/com/coinbase/exchange/api/exchange/CoinbaseExchangeException.java b/api/src/main/java/com/coinbase/exchange/api/exchange/CoinbaseExchangeException.java
new file mode 100644
index 00000000..e84808f6
--- /dev/null
+++ b/api/src/main/java/com/coinbase/exchange/api/exchange/CoinbaseExchangeException.java
@@ -0,0 +1,31 @@
+package com.coinbase.exchange.api.exchange;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.springframework.web.client.HttpClientErrorException;
+
+public class CoinbaseExchangeException extends Exception {
+    public CoinbaseExchangeException(final String message, final Throwable cause) {
+        super(message, cause);
+    }
+
+    static CoinbaseExchangeException create(final HttpClientErrorException cause, final ObjectMapper objectMapper) {
+        String message = null;
+        try {
+            final Error error = objectMapper.readValue(cause.getResponseBodyAsString(), Error.class);
+            message = error.getMessage();
+        } catch (JsonProcessingException e) {
+            // ignore
+        }
+
+        return new CoinbaseExchangeException(message, cause);
+    }
+
+    private static class Error {
+        private String message;
+
+        public String getMessage() {
+            return message;
+        }
+    }
+}
diff --git a/api/src/main/java/com/coinbase/exchange/api/exchange/CoinbaseExchangeImpl.java b/api/src/main/java/com/coinbase/exchange/api/exchange/CoinbaseExchangeImpl.java
index c798eee9..3d145299 100644
--- a/api/src/main/java/com/coinbase/exchange/api/exchange/CoinbaseExchangeImpl.java
+++ b/api/src/main/java/com/coinbase/exchange/api/exchange/CoinbaseExchangeImpl.java
@@ -48,7 +48,7 @@ public CoinbaseExchangeImpl(final String publicKey,
     }
 
     @Override
-    public <T> T get(String resourcePath, ParameterizedTypeReference<T> responseType) {
+    public <T> T get(String resourcePath, ParameterizedTypeReference<T> responseType) throws CoinbaseExchangeException {
         try {
             ResponseEntity<T> responseEntity = restTemplate.exchange(getBaseUrl() + resourcePath,
                     HttpMethod.GET,
@@ -59,12 +59,13 @@ public <T> T get(String resourcePath, ParameterizedTypeReference<T> responseType
             return responseEntity.getBody();
         } catch (HttpClientErrorException ex) {
             log.error("GET request Failed for '" + resourcePath + "': " + ex.getResponseBodyAsString());
+            throw CoinbaseExchangeException.create(ex, objectMapper);
         }
-        return null;
     }
 
     @Override
-    public <T> List<T> getAsList(String resourcePath, ParameterizedTypeReference<T[]> responseType) {
+    public <T> List<T> getAsList(String resourcePath, ParameterizedTypeReference<T[]> responseType)
+            throws CoinbaseExchangeException {
        T[] result = get(resourcePath, responseType);
 
        return result == null ? emptyList() : Arrays.asList(result);
@@ -75,7 +76,7 @@ public <T> T pagedGet(String resourcePath,
                           ParameterizedTypeReference<T> responseType,
                           String beforeOrAfter,
                           Integer pageNumber,
-                          Integer limit) {
+                          Integer limit) throws CoinbaseExchangeException {
         resourcePath += "?" + beforeOrAfter + "=" + pageNumber + "&limit=" + limit;
         return get(resourcePath, responseType);
     }
@@ -85,13 +86,14 @@ public <T> List<T> pagedGetAsList(String resourcePath,
                           ParameterizedTypeReference<T[]> responseType,
                           String beforeOrAfter,
                           Integer pageNumber,
-                          Integer limit) {
+                          Integer limit) throws CoinbaseExchangeException {
         T[] result = pagedGet(resourcePath, responseType, beforeOrAfter, pageNumber, limit );
         return result == null ? emptyList() : Arrays.asList(result);
     }
 
     @Override
-    public <T> T delete(String resourcePath, ParameterizedTypeReference<T> responseType) {
+    public <T> T delete(String resourcePath, ParameterizedTypeReference<T> responseType)
+            throws CoinbaseExchangeException {
         try {
             ResponseEntity<T> response = restTemplate.exchange(getBaseUrl() + resourcePath,
                 HttpMethod.DELETE,
@@ -100,12 +102,13 @@ public <T> T delete(String resourcePath, ParameterizedTypeReference<T> responseT
             return response.getBody();
         } catch (HttpClientErrorException ex) {
             log.error("DELETE request Failed for '" + resourcePath + "': " + ex.getResponseBodyAsString());
+            throw CoinbaseExchangeException.create(ex, objectMapper);
         }
-        return null;
     }
 
     @Override
-    public <T, R> T post(String resourcePath,  ParameterizedTypeReference<T> responseType, R jsonObj) {
+    public <T, R> T post(String resourcePath,  ParameterizedTypeReference<T> responseType, R jsonObj)
+            throws CoinbaseExchangeException {
         String jsonBody = toJson(jsonObj);
 
         try {
@@ -116,8 +119,8 @@ public <T, R> T post(String resourcePath,  ParameterizedTypeReference<T> respons
             return response.getBody();
         } catch (HttpClientErrorException ex) {
             log.error("POST request Failed for '" + resourcePath + "': " + ex.getResponseBodyAsString());
+            throw CoinbaseExchangeException.create(ex, objectMapper);
         }
-        return null;
     }
 
     @Override
diff --git a/api/src/main/java/com/coinbase/exchange/api/marketdata/MarketData.java b/api/src/main/java/com/coinbase/exchange/api/marketdata/MarketData.java
index ad2f319e..db7eb1b7 100644
--- a/api/src/main/java/com/coinbase/exchange/api/marketdata/MarketData.java
+++ b/api/src/main/java/com/coinbase/exchange/api/marketdata/MarketData.java
@@ -42,4 +42,13 @@ public List<OrderItem> getAsks() {
     public void setAsks(List<OrderItem> asks) {
         this.asks = asks;
     }
+
+    @Override
+    public String toString() {
+        return "MarketData{"
+                + "sequence=" + sequence
+                + ", bids=" + bids
+                + ", asks=" + asks
+                + '}';
+    }
 }
diff --git a/api/src/main/java/com/coinbase/exchange/api/marketdata/MarketDataService.java b/api/src/main/java/com/coinbase/exchange/api/marketdata/MarketDataService.java
index 7e85ae92..91266103 100644
--- a/api/src/main/java/com/coinbase/exchange/api/marketdata/MarketDataService.java
+++ b/api/src/main/java/com/coinbase/exchange/api/marketdata/MarketDataService.java
@@ -1,6 +1,7 @@
 package com.coinbase.exchange.api.marketdata;
 
 import com.coinbase.exchange.api.exchange.CoinbaseExchange;
+import com.coinbase.exchange.api.exchange.CoinbaseExchangeException;
 import org.springframework.core.ParameterizedTypeReference;
 
 import java.util.List;
@@ -18,14 +19,14 @@ public MarketDataService(final CoinbaseExchange exchange) {
 
     public static final String PRODUCT_ENDPOINT = "/products";
 
-    public MarketData getMarketDataOrderBook(String productId, int level) {
+    public MarketData getMarketDataOrderBook(String productId, int level) throws CoinbaseExchangeException {
         String marketDataEndpoint = PRODUCT_ENDPOINT + "/" + productId + "/book";
         if(level != 1)
             marketDataEndpoint += "?level=" + level;
        return exchange.get(marketDataEndpoint, new ParameterizedTypeReference<MarketData>(){});
     }
 
-    public List<Trade> getTrades(String productId) {
+    public List<Trade> getTrades(String productId) throws CoinbaseExchangeException {
         String tradesEndpoint = PRODUCT_ENDPOINT + "/" + productId + "/trades";
         return exchange.getAsList(tradesEndpoint, new ParameterizedTypeReference<Trade[]>(){});
     }
diff --git a/api/src/main/java/com/coinbase/exchange/api/marketdata/Message.java b/api/src/main/java/com/coinbase/exchange/api/marketdata/Message.java
index 87b17af4..61e28595 100644
--- a/api/src/main/java/com/coinbase/exchange/api/marketdata/Message.java
+++ b/api/src/main/java/com/coinbase/exchange/api/marketdata/Message.java
@@ -106,4 +106,20 @@ public void setTime(String time) {
         this.time = time;
     }
 
+    @Override
+    public String toString() {
+        return "Message{"
+                + "type='" + type + '\''
+                + ", sequence=" + sequence
+                + ", order_id='" + order_id + '\''
+                + ", size=" + size
+                + ", price=" + price
+                + ", side='" + side + '\''
+                + ", remaining_size=" + remaining_size
+                + ", reason='" + reason + '\''
+                + ", maker_order_id='" + maker_order_id + '\''
+                + ", taker_order_id='" + taker_order_id + '\''
+                + ", time='" + time + '\''
+                + '}';
+    }
 }
diff --git a/api/src/main/java/com/coinbase/exchange/api/orders/Order.java b/api/src/main/java/com/coinbase/exchange/api/orders/Order.java
index f1dfb1b7..bf111dde 100644
--- a/api/src/main/java/com/coinbase/exchange/api/orders/Order.java
+++ b/api/src/main/java/com/coinbase/exchange/api/orders/Order.java
@@ -176,12 +176,24 @@ public void setSettled(Boolean settled) {
         this.settled = settled;
     }
 
+    @Override
     public String toString() {
-        String orderString = getSide();
-        orderString += ": " + getProduct_id();
-        orderString += ": " + getPrice();
-        orderString += ": " + getSize();
-        return orderString;
+        return "Order{"
+                + "id='" + id + '\''
+                + ", size='" + size + '\''
+                + ", price='" + price + '\''
+                + ", product_id='" + product_id + '\''
+                + ", side='" + side + '\''
+                + ", stp='" + stp + '\''
+                + ", type='" + type + '\''
+                + ", time_in_force='" + time_in_force + '\''
+                + ", post_only='" + post_only + '\''
+                + ", created_at='" + created_at + '\''
+                + ", fill_fees='" + fill_fees + '\''
+                + ", filled_size='" + filled_size + '\''
+                + ", executed_value='" + executed_value + '\''
+                + ", status='" + status + '\''
+                + ", settled=" + settled
+                + '}';
     }
-
 }
diff --git a/api/src/main/java/com/coinbase/exchange/api/orders/OrderService.java b/api/src/main/java/com/coinbase/exchange/api/orders/OrderService.java
index c75e94f4..c553bd16 100644
--- a/api/src/main/java/com/coinbase/exchange/api/orders/OrderService.java
+++ b/api/src/main/java/com/coinbase/exchange/api/orders/OrderService.java
@@ -1,5 +1,6 @@
 package com.coinbase.exchange.api.orders;
 
+import com.coinbase.exchange.api.exchange.CoinbaseExchangeException;
 import com.coinbase.exchange.model.Fill;
 import com.coinbase.exchange.model.Hold;
 import com.coinbase.exchange.model.NewOrderSingle;
@@ -22,40 +23,40 @@ public OrderService(final CoinbaseExchange exchange) {
         this.exchange = exchange;
     }
 
-    public List<Hold> getHolds(String accountId) {
+    public List<Hold> getHolds(String accountId) throws CoinbaseExchangeException {
         return exchange.getAsList(ORDERS_ENDPOINT + "/" + accountId + "/holds", new ParameterizedTypeReference<Hold[]>(){});
     }
 
-    public List<Order> getOpenOrders(String accountId) {
+    public List<Order> getOpenOrders(String accountId) throws CoinbaseExchangeException {
         return exchange.getAsList(ORDERS_ENDPOINT + "/" + accountId + "/orders", new ParameterizedTypeReference<Order[]>(){});
     }
 
-    public Order getOrder(String orderId) {
+    public Order getOrder(String orderId) throws CoinbaseExchangeException {
         return exchange.get(ORDERS_ENDPOINT + "/" + orderId,new ParameterizedTypeReference<Order>(){});
     }
 
-    public Order createOrder(NewOrderSingle order) {
+    public Order createOrder(NewOrderSingle order) throws CoinbaseExchangeException {
         return exchange.post(ORDERS_ENDPOINT, new ParameterizedTypeReference<Order>(){}, order);
     }
 
-    public String cancelOrder(String orderId) {
+    public String cancelOrder(String orderId) throws CoinbaseExchangeException {
         String deleteEndpoint = ORDERS_ENDPOINT + "/" + orderId;
         return exchange.delete(deleteEndpoint, new ParameterizedTypeReference<String>(){});
     }
 
-    public List<Order> getOpenOrders() {
+    public List<Order> getOpenOrders() throws CoinbaseExchangeException {
         return exchange.getAsList(ORDERS_ENDPOINT, new ParameterizedTypeReference<Order[]>(){});
     }
 
-    public List<Order> cancelAllOpenOrders() {
+    public List<Order> cancelAllOpenOrders() throws CoinbaseExchangeException {
         return Arrays.asList(exchange.delete(ORDERS_ENDPOINT, new ParameterizedTypeReference<Order[]>(){}));
     }
 
-    public List<Fill> getFillsByProductId(String product_id, int resultLimit) {
+    public List<Fill> getFillsByProductId(String product_id, int resultLimit) throws CoinbaseExchangeException {
         return exchange.getAsList(FILLS_ENDPOINT + "?product_id=" + product_id + "&limit=" + resultLimit, new ParameterizedTypeReference<Fill[]>(){});
     }
-    
-    public List<Fill> getFillByOrderId(String order_id, int resultLimit) {
+
+    public List<Fill> getFillByOrderId(String order_id, int resultLimit) throws CoinbaseExchangeException {
         return exchange.getAsList(FILLS_ENDPOINT + "?order_id=" + order_id + "&limit=" + resultLimit, new ParameterizedTypeReference<Fill[]>(){});
     }
 }
diff --git a/api/src/main/java/com/coinbase/exchange/api/payments/AccountLimit.java b/api/src/main/java/com/coinbase/exchange/api/payments/AccountLimit.java
index 0d10e414..81d891e8 100644
--- a/api/src/main/java/com/coinbase/exchange/api/payments/AccountLimit.java
+++ b/api/src/main/java/com/coinbase/exchange/api/payments/AccountLimit.java
@@ -40,4 +40,13 @@ public Amount getRemaining() {
     public void setRemaining(Amount remaining) {
         this.remaining = remaining;
     }
+
+    @Override
+    public String toString() {
+        return "AccountLimit{"
+                + "period_in_days=" + period_in_days
+                + ", total=" + total
+                + ", remaining=" + remaining
+                + '}';
+    }
 }
diff --git a/api/src/main/java/com/coinbase/exchange/api/payments/Amount.java b/api/src/main/java/com/coinbase/exchange/api/payments/Amount.java
index 36fe6117..a447fcfd 100644
--- a/api/src/main/java/com/coinbase/exchange/api/payments/Amount.java
+++ b/api/src/main/java/com/coinbase/exchange/api/payments/Amount.java
@@ -32,4 +32,12 @@ public String getCurrency() {
     public void setCurrency(String currency) {
         this.currency = currency;
     }
+
+    @Override
+    public String toString() {
+        return "Amount{"
+                + "amount=" + amount
+                + ", currency='" + currency + '\''
+                + '}';
+    }
 }
diff --git a/api/src/main/java/com/coinbase/exchange/api/payments/BankCountry.java b/api/src/main/java/com/coinbase/exchange/api/payments/BankCountry.java
index 19a3bb42..c29237b8 100644
--- a/api/src/main/java/com/coinbase/exchange/api/payments/BankCountry.java
+++ b/api/src/main/java/com/coinbase/exchange/api/payments/BankCountry.java
@@ -30,4 +30,12 @@ public String getName() {
     public void setName(String name) {
         this.name = name;
     }
+
+    @Override
+    public String toString() {
+        return "BankCountry{"
+                + "code='" + code + '\''
+                + ", name='" + name + '\''
+                + '}';
+    }
 }
diff --git a/api/src/main/java/com/coinbase/exchange/api/payments/CoinbaseAccount.java b/api/src/main/java/com/coinbase/exchange/api/payments/CoinbaseAccount.java
index 216b43d9..14f92309 100644
--- a/api/src/main/java/com/coinbase/exchange/api/payments/CoinbaseAccount.java
+++ b/api/src/main/java/com/coinbase/exchange/api/payments/CoinbaseAccount.java
@@ -110,4 +110,19 @@ public SepaDepositInformation getSepa_deposit_information() {
     public void setSepa_deposit_information(SepaDepositInformation sepa_deposit_information) {
         this.sepa_deposit_information = sepa_deposit_information;
     }
+
+    @Override
+    public String toString() {
+        return "CoinbaseAccount{"
+                + "id='" + id + '\''
+                + ", name='" + name + '\''
+                + ", balance=" + balance
+                + ", currency='" + currency + '\''
+                + ", type='" + type + '\''
+                + ", primary=" + primary
+                + ", active=" + active
+                + ", wire_deposit_information=" + wire_deposit_information
+                + ", sepa_deposit_information=" + sepa_deposit_information
+                + '}';
+    }
 }
diff --git a/api/src/main/java/com/coinbase/exchange/api/payments/DepositInformation.java b/api/src/main/java/com/coinbase/exchange/api/payments/DepositInformation.java
index 13ea5a7b..1a523045 100644
--- a/api/src/main/java/com/coinbase/exchange/api/payments/DepositInformation.java
+++ b/api/src/main/java/com/coinbase/exchange/api/payments/DepositInformation.java
@@ -97,4 +97,18 @@ public String getReference() {
     public void setReference(String reference) {
         this.reference = reference;
     }
+
+    @Override
+    public String toString() {
+        return "DepositInformation{"
+                + "account_number='" + account_number + '\''
+                + ", routing_number='" + routing_number + '\''
+                + ", bank_name='" + bank_name + '\''
+                + ", bank_address='" + bank_address + '\''
+                + ", bank_country=" + bank_country
+                + ", account_name='" + account_name + '\''
+                + ", account_address='" + account_address + '\''
+                + ", reference='" + reference + '\''
+                + '}';
+    }
 }
diff --git a/api/src/main/java/com/coinbase/exchange/api/payments/Limit.java b/api/src/main/java/com/coinbase/exchange/api/payments/Limit.java
index 625ad7fd..6194ad59 100644
--- a/api/src/main/java/com/coinbase/exchange/api/payments/Limit.java
+++ b/api/src/main/java/com/coinbase/exchange/api/payments/Limit.java
@@ -1,5 +1,7 @@
 package com.coinbase.exchange.api.payments;
 
+import java.util.Arrays;
+
 /**
  * Created by robevansuk on 16/02/2017.
  */
@@ -50,4 +52,14 @@ public AccountLimit[] getDeposit() {
     public void setDeposit(AccountLimit[] deposit) {
         this.deposit = deposit;
     }
+
+    @Override
+    public String toString() {
+        return "Limit{"
+                + "buy=" + Arrays.toString(buy)
+                + ", instant_buy=" + Arrays.toString(instant_buy)
+                + ", sell=" + Arrays.toString(sell)
+                + ", deposit=" + Arrays.toString(deposit)
+                + '}';
+    }
 }
diff --git a/api/src/main/java/com/coinbase/exchange/api/payments/PaymentService.java b/api/src/main/java/com/coinbase/exchange/api/payments/PaymentService.java
index 655f80c5..11afb064 100644
--- a/api/src/main/java/com/coinbase/exchange/api/payments/PaymentService.java
+++ b/api/src/main/java/com/coinbase/exchange/api/payments/PaymentService.java
@@ -1,6 +1,7 @@
 package com.coinbase.exchange.api.payments;
 
 import com.coinbase.exchange.api.exchange.CoinbaseExchange;
+import com.coinbase.exchange.api.exchange.CoinbaseExchangeException;
 import org.springframework.core.ParameterizedTypeReference;
 
 import java.util.List;
@@ -19,11 +20,11 @@ public PaymentService(final CoinbaseExchange coinbaseExchange) {
         this.coinbaseExchange = coinbaseExchange;
     }
 
-    public List<PaymentType> getPaymentTypes() {
+    public List<PaymentType> getPaymentTypes() throws CoinbaseExchangeException {
         return coinbaseExchange.getAsList(PAYMENT_METHODS_ENDPOINT, new ParameterizedTypeReference<PaymentType[]>(){});
     }
 
-    public List<CoinbaseAccount> getCoinbaseAccounts() {
+    public List<CoinbaseAccount> getCoinbaseAccounts() throws CoinbaseExchangeException {
         return coinbaseExchange.getAsList(COINBASE_ACCOUNTS_ENDPOINT, new ParameterizedTypeReference<CoinbaseAccount[]>() {});
     }
-}
\ No newline at end of file
+}
diff --git a/api/src/main/java/com/coinbase/exchange/api/payments/PaymentType.java b/api/src/main/java/com/coinbase/exchange/api/payments/PaymentType.java
index d0cbd52e..f490e95a 100644
--- a/api/src/main/java/com/coinbase/exchange/api/payments/PaymentType.java
+++ b/api/src/main/java/com/coinbase/exchange/api/payments/PaymentType.java
@@ -129,4 +129,21 @@ public Limit getLimits() {
     public void setLimits(Limit limits) {
         this.limits = limits;
     }
+
+    @Override
+    public String toString() {
+        return "PaymentType{"
+                + "id='" + id + '\''
+                + ", type='" + type + '\''
+                + ", name='" + name + '\''
+                + ", currency='" + currency + '\''
+                + ", primary_buy=" + primary_buy
+                + ", primary_sell=" + primary_sell
+                + ", allow_buy=" + allow_buy
+                + ", allow_sell=" + allow_sell
+                + ", allow_deposit=" + allow_deposit
+                + ", allow_withdraw=" + allow_withdraw
+                + ", limits=" + limits
+                + '}';
+    }
 }
diff --git a/api/src/main/java/com/coinbase/exchange/api/payments/SepaDepositInformation.java b/api/src/main/java/com/coinbase/exchange/api/payments/SepaDepositInformation.java
index a407d98d..6302335d 100644
--- a/api/src/main/java/com/coinbase/exchange/api/payments/SepaDepositInformation.java
+++ b/api/src/main/java/com/coinbase/exchange/api/payments/SepaDepositInformation.java
@@ -97,4 +97,18 @@ public String getReference() {
     public void setReference(String reference) {
         this.reference = reference;
     }
+
+    @Override
+    public String toString() {
+        return "SepaDepositInformation{"
+                + "iban='" + iban + '\''
+                + ", swift='" + swift + '\''
+                + ", bank_name='" + bank_name + '\''
+                + ", bank_address='" + bank_address + '\''
+                + ", bank_country_name='" + bank_country_name + '\''
+                + ", account_name='" + account_name + '\''
+                + ", account_address='" + account_address + '\''
+                + ", reference='" + reference + '\''
+                + '}';
+    }
 }
diff --git a/api/src/main/java/com/coinbase/exchange/api/products/ProductService.java b/api/src/main/java/com/coinbase/exchange/api/products/ProductService.java
index 77d36930..c9a63b5c 100644
--- a/api/src/main/java/com/coinbase/exchange/api/products/ProductService.java
+++ b/api/src/main/java/com/coinbase/exchange/api/products/ProductService.java
@@ -1,6 +1,7 @@
 package com.coinbase.exchange.api.products;
 
 import com.coinbase.exchange.api.exchange.CoinbaseExchange;
+import com.coinbase.exchange.api.exchange.CoinbaseExchangeException;
 import com.coinbase.exchange.model.Candles;
 import com.coinbase.exchange.model.Granularity;
 import com.coinbase.exchange.model.Product;
@@ -29,17 +30,17 @@ public ProductService(final CoinbaseExchange exchange) {
     }
 
     // no paged products necessary
-    public List<Product> getProducts() {
+    public List<Product> getProducts() throws CoinbaseExchangeException {
         return exchange.getAsList(PRODUCTS_ENDPOINT, new ParameterizedTypeReference<Product[]>() {
         });
     }
 
-    public Candles getCandles(String productId) {
+    public Candles getCandles(String productId) throws CoinbaseExchangeException {
         return new Candles(exchange.get(PRODUCTS_ENDPOINT + "/" + productId + "/candles", new ParameterizedTypeReference<List<String[]>>() {
         }));
     }
 
-    public Candles getCandles(String productId, Map<String, String> queryParams) {
+    public Candles getCandles(String productId, Map<String, String> queryParams) throws CoinbaseExchangeException {
         StringBuffer url = new StringBuffer(PRODUCTS_ENDPOINT + "/" + productId + "/candles");
         if (queryParams != null && queryParams.size() != 0) {
             url.append("?");
@@ -54,7 +55,8 @@ public Candles getCandles(String productId, Map<String, String> queryParams) {
      * If either one of the start or end fields are not provided then both fields will be ignored.
      * If a custom time range is not declared then one ending now is selected.
      */
-    public Candles getCandles(String productId, Instant startTime, Instant endTime, Granularity granularity) {
+    public Candles getCandles(String productId, Instant startTime, Instant endTime, Granularity granularity)
+            throws CoinbaseExchangeException {
 
         Map<String, String> queryParams = new HashMap<>();
 
@@ -74,14 +76,14 @@ public Candles getCandles(String productId, Instant startTime, Instant endTime,
     /**
      * The granularity field must be one of the following values: {60, 300, 900, 3600, 21600, 86400}
      */
-    public Candles getCandles(String productId, Granularity granularity) {
+    public Candles getCandles(String productId, Granularity granularity) throws CoinbaseExchangeException {
         return getCandles(productId, null, null, granularity);
     }
 
     /**
      *  If either one of the start or end fields are not provided then both fields will be ignored.
      */
-    public Candles getCandles(String productId, Instant start, Instant end) {
+    public Candles getCandles(String productId, Instant start, Instant end) throws CoinbaseExchangeException {
         return getCandles(productId, start, end, null);
     }
 }
diff --git a/api/src/main/java/com/coinbase/exchange/api/reports/ReportRequest.java b/api/src/main/java/com/coinbase/exchange/api/reports/ReportRequest.java
index af9775b3..4ba2eb38 100644
--- a/api/src/main/java/com/coinbase/exchange/api/reports/ReportRequest.java
+++ b/api/src/main/java/com/coinbase/exchange/api/reports/ReportRequest.java
@@ -40,4 +40,13 @@ public String getEnd_date() {
     public void setEnd_date(String end_date) {
         this.end_date = end_date;
     }
+
+    @Override
+    public String toString() {
+        return "ReportRequest{"
+                + "type='" + type + '\''
+                + ", start_date='" + start_date + '\''
+                + ", end_date='" + end_date + '\''
+                + '}';
+    }
 }
diff --git a/api/src/main/java/com/coinbase/exchange/api/reports/ReportResponse.java b/api/src/main/java/com/coinbase/exchange/api/reports/ReportResponse.java
index 2cfca30d..6533bca9 100644
--- a/api/src/main/java/com/coinbase/exchange/api/reports/ReportResponse.java
+++ b/api/src/main/java/com/coinbase/exchange/api/reports/ReportResponse.java
@@ -97,4 +97,18 @@ public TimePeriod getParams() {
     public void setParams(TimePeriod params) {
         this.params = params;
     }
+
+    @Override
+    public String toString() {
+        return "ReportResponse{"
+                + "id='" + id + '\''
+                + ", type='" + type + '\''
+                + ", status='" + status + '\''
+                + ", created_at='" + created_at + '\''
+                + ", completed_at='" + completed_at + '\''
+                + ", expires_at='" + expires_at + '\''
+                + ", file_url='" + file_url + '\''
+                + ", params=" + params
+                + '}';
+    }
 }
diff --git a/api/src/main/java/com/coinbase/exchange/api/reports/ReportService.java b/api/src/main/java/com/coinbase/exchange/api/reports/ReportService.java
index 2035f0bc..67440549 100644
--- a/api/src/main/java/com/coinbase/exchange/api/reports/ReportService.java
+++ b/api/src/main/java/com/coinbase/exchange/api/reports/ReportService.java
@@ -1,6 +1,7 @@
 package com.coinbase.exchange.api.reports;
 
 import com.coinbase.exchange.api.exchange.CoinbaseExchange;
+import com.coinbase.exchange.api.exchange.CoinbaseExchangeException;
 import org.springframework.core.ParameterizedTypeReference;
 
 /**
@@ -17,13 +18,13 @@ public ReportService(final CoinbaseExchange coinbaseExchange) {
     }
 
     // TODO untested
-    public ReportResponse createReport(String type, String startDate, String endDate){
+    public ReportResponse createReport(String type, String startDate, String endDate) throws CoinbaseExchangeException {
         ReportRequest reportRequest = new ReportRequest(type, startDate, endDate);
         return coinbaseExchange.post(REPORTS_ENDPOINT, new ParameterizedTypeReference<ReportResponse>(){}, reportRequest);
     }
 
     // TODO untested
-    public ReportResponse getReportStatus(String id) {
+    public ReportResponse getReportStatus(String id) throws CoinbaseExchangeException {
         return coinbaseExchange.get(REPORTS_ENDPOINT + "/" + id, new ParameterizedTypeReference<ReportResponse>(){});
     }
 }
diff --git a/api/src/main/java/com/coinbase/exchange/api/reports/TimePeriod.java b/api/src/main/java/com/coinbase/exchange/api/reports/TimePeriod.java
index a3e8713c..650aa982 100644
--- a/api/src/main/java/com/coinbase/exchange/api/reports/TimePeriod.java
+++ b/api/src/main/java/com/coinbase/exchange/api/reports/TimePeriod.java
@@ -30,4 +30,12 @@ public String getEnd_date() {
     public void setEnd_date(String end_date) {
         this.end_date = end_date;
     }
+
+    @Override
+    public String toString() {
+        return "TimePeriod{"
+                + "start_date='" + start_date + '\''
+                + ", end_date='" + end_date + '\''
+                + '}';
+    }
 }
diff --git a/api/src/main/java/com/coinbase/exchange/api/transfers/Transfer.java b/api/src/main/java/com/coinbase/exchange/api/transfers/Transfer.java
index 8dd0a382..8c1e4799 100644
--- a/api/src/main/java/com/coinbase/exchange/api/transfers/Transfer.java
+++ b/api/src/main/java/com/coinbase/exchange/api/transfers/Transfer.java
@@ -42,4 +42,13 @@ public String getCoinbase_account_id() {
     public void setCoinbase_account_id(String coinbase_account_id) {
         this.coinbase_account_id = coinbase_account_id;
     }
+
+    @Override
+    public String toString() {
+        return "Transfer{"
+                + "type='" + type + '\''
+                + ", amount=" + amount
+                + ", coinbase_account_id='" + coinbase_account_id + '\''
+                + '}';
+    }
 }
diff --git a/api/src/main/java/com/coinbase/exchange/api/transfers/TransferService.java b/api/src/main/java/com/coinbase/exchange/api/transfers/TransferService.java
index 57010abb..2bcdf63f 100644
--- a/api/src/main/java/com/coinbase/exchange/api/transfers/TransferService.java
+++ b/api/src/main/java/com/coinbase/exchange/api/transfers/TransferService.java
@@ -1,6 +1,7 @@
 package com.coinbase.exchange.api.transfers;
 
 import com.coinbase.exchange.api.exchange.CoinbaseExchange;
+import com.coinbase.exchange.api.exchange.CoinbaseExchangeException;
 import org.springframework.core.ParameterizedTypeReference;
 
 import java.math.BigDecimal;
@@ -28,7 +29,7 @@ public TransferService(final CoinbaseExchange coinbaseExchange) {
      * @param coinbaseAccountId
      * @return
      */
-    public String transfer(String type, BigDecimal amount, String coinbaseAccountId) {
+    public String transfer(String type, BigDecimal amount, String coinbaseAccountId) throws CoinbaseExchangeException {
         return coinbaseExchange.post(TRANSFER_ENDPOINT,
                 new ParameterizedTypeReference<String>(){},
                 new Transfer(type, amount, coinbaseAccountId));
diff --git a/api/src/main/java/com/coinbase/exchange/api/useraccount/UserAccountData.java b/api/src/main/java/com/coinbase/exchange/api/useraccount/UserAccountData.java
index acd344ba..7ace0f67 100644
--- a/api/src/main/java/com/coinbase/exchange/api/useraccount/UserAccountData.java
+++ b/api/src/main/java/com/coinbase/exchange/api/useraccount/UserAccountData.java
@@ -52,4 +52,14 @@ public String getRecorded_at() {
     public void setRecorded_at(String recorded_at) {
         this.recorded_at = recorded_at;
     }
+
+    @Override
+    public String toString() {
+        return "UserAccountData{"
+                + "product_id='" + product_id + '\''
+                + ", exchange_volume=" + exchange_volume
+                + ", volume=" + volume
+                + ", recorded_at='" + recorded_at + '\''
+                + '}';
+    }
 }
diff --git a/api/src/main/java/com/coinbase/exchange/api/useraccount/UserAccountService.java b/api/src/main/java/com/coinbase/exchange/api/useraccount/UserAccountService.java
index 3b38a69d..fab7a9d9 100644
--- a/api/src/main/java/com/coinbase/exchange/api/useraccount/UserAccountService.java
+++ b/api/src/main/java/com/coinbase/exchange/api/useraccount/UserAccountService.java
@@ -1,6 +1,7 @@
 package com.coinbase.exchange.api.useraccount;
 
 import com.coinbase.exchange.api.exchange.CoinbaseExchange;
+import com.coinbase.exchange.api.exchange.CoinbaseExchangeException;
 import org.springframework.core.ParameterizedTypeReference;
 
 import java.util.List;
@@ -22,7 +23,7 @@ public UserAccountService(final CoinbaseExchange coinbaseExchange) {
      * Returns the 30 day trailing volume information from all accounts
      * @return UserAccountData
      */
-    public List<UserAccountData> getTrailingVolume(){
+    public List<UserAccountData> getTrailingVolume() throws CoinbaseExchangeException {
         return coinbaseExchange.getAsList(USER_ACCOUNT_ENDPOINT, new ParameterizedTypeReference<UserAccountData[]>() {});
     }
 }
diff --git a/api/src/main/java/com/coinbase/exchange/api/withdrawals/WithdrawalsService.java b/api/src/main/java/com/coinbase/exchange/api/withdrawals/WithdrawalsService.java
index 56869460..06c67f82 100644
--- a/api/src/main/java/com/coinbase/exchange/api/withdrawals/WithdrawalsService.java
+++ b/api/src/main/java/com/coinbase/exchange/api/withdrawals/WithdrawalsService.java
@@ -1,6 +1,7 @@
 package com.coinbase.exchange.api.withdrawals;
 
 import com.coinbase.exchange.api.exchange.CoinbaseExchange;
+import com.coinbase.exchange.api.exchange.CoinbaseExchangeException;
 import com.coinbase.exchange.model.CoinbasePaymentRequest;
 import com.coinbase.exchange.model.CryptoPaymentRequest;
 import com.coinbase.exchange.model.MonetaryRequest;
@@ -27,25 +28,29 @@ public WithdrawalsService(final CoinbaseExchange coinbaseExchange) {
         this.coinbaseExchange = coinbaseExchange;
     }
 
-    public PaymentResponse makeWithdrawalToPaymentMethod(BigDecimal amount, String currency, String paymentMethodId) {
+    public PaymentResponse makeWithdrawalToPaymentMethod(BigDecimal amount, String currency, String paymentMethodId)
+            throws CoinbaseExchangeException {
         PaymentRequest request = new PaymentRequest(amount, currency, paymentMethodId);
         return makeWithdrawal(request, PAYMENT_METHOD);
     }
 
     // TODO untested - needs coinbase account ID to work.
-    public PaymentResponse makeWithdrawalToCoinbase(BigDecimal amount, String currency, String coinbaseAccountId) {
+    public PaymentResponse makeWithdrawalToCoinbase(BigDecimal amount, String currency, String coinbaseAccountId)
+            throws CoinbaseExchangeException {
         CoinbasePaymentRequest request = new CoinbasePaymentRequest(amount.setScale(8, RoundingMode.HALF_DOWN), currency, coinbaseAccountId);
         return makeWithdrawal(request, COINBASE);
     }
 
     // TODO untested - needs a crypto currency account address
-    public PaymentResponse makeWithdrawalToCryptoAccount(BigDecimal amount, String currency, String cryptoAccountAddress) {
+    public PaymentResponse makeWithdrawalToCryptoAccount(BigDecimal amount, String currency, String cryptoAccountAddress)
+            throws CoinbaseExchangeException {
         CryptoPaymentRequest request = new CryptoPaymentRequest(amount.setScale(8, RoundingMode.HALF_DOWN), currency, cryptoAccountAddress);
         return makeWithdrawal(request, CRYPTO);
     }
 
 
-    private PaymentResponse makeWithdrawal(MonetaryRequest request, String withdrawalType) {
+    private PaymentResponse makeWithdrawal(MonetaryRequest request, String withdrawalType)
+            throws CoinbaseExchangeException {
         return coinbaseExchange.post(WITHDRAWALS_ENDPOINT+ withdrawalType,
                 new ParameterizedTypeReference<PaymentResponse>() {},
                 request);
diff --git a/api/src/test/java/com/coinbase/exchange/api/accounts/AccountsIntegrationTest.java b/api/src/test/java/com/coinbase/exchange/api/accounts/AccountsIntegrationTest.java
index 5462cd06..ad240246 100644
--- a/api/src/test/java/com/coinbase/exchange/api/accounts/AccountsIntegrationTest.java
+++ b/api/src/test/java/com/coinbase/exchange/api/accounts/AccountsIntegrationTest.java
@@ -2,6 +2,7 @@
 
 import com.coinbase.exchange.api.BaseIntegrationTest;
 import com.coinbase.exchange.api.config.IntegrationTestConfiguration;
+import com.coinbase.exchange.api.exchange.CoinbaseExchangeException;
 import com.coinbase.exchange.model.Hold;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
@@ -31,27 +32,27 @@ void setUp() {
     }
 
     @Test
-    public void canGetAccounts() {
+    public void canGetAccounts() throws CoinbaseExchangeException {
         List<Account> accounts  = accountService.getAccounts();
         assertNotNull(accounts);
     }
 
     @Test
-    public void getAccount() {
+    public void getAccount() throws CoinbaseExchangeException {
         List<Account> accounts  = accountService.getAccounts();
         Account account = accountService.getAccount(accounts.get(0).getId());
         assertNotNull(account);
     }
 
     @Test
-    public void canGetAccountHistory() {
+    public void canGetAccountHistory() throws CoinbaseExchangeException {
         List<Account> accounts = accountService.getAccounts();
         List<AccountHistory> history = accountService.getAccountHistory(accounts.get(0).getId());
         assertNotNull(history); // anything but null/error.
     }
 
     @Test
-    public void canGetAccountHolds() {
+    public void canGetAccountHolds() throws CoinbaseExchangeException {
         List<Account> accounts = accountService.getAccounts();
         List<Hold> holds = accountService.getHolds(accounts.get(0).getId());
         assertNotNull(holds);
@@ -66,7 +67,7 @@ public void canGetAccountHolds() {
      * only if before is null and after is not-null will the after param be inserted.
      */
     @Test
-    public void canGetPagedAccountHistory() {
+    public void canGetPagedAccountHistory() throws CoinbaseExchangeException {
         List<Account> accounts = accountService.getAccounts();
         assertTrue(accounts.size() > 0);
         String beforeOrAfter = "before";
@@ -79,7 +80,7 @@ public void canGetPagedAccountHistory() {
     }
 
     @Test
-    public void canGetPagedHolds() {
+    public void canGetPagedHolds() throws CoinbaseExchangeException {
         List<Account> accounts = accountService.getAccounts();
 
         assertTrue(accounts!=null);
diff --git a/api/src/test/java/com/coinbase/exchange/api/accounts/DepositIntegrationTest.java b/api/src/test/java/com/coinbase/exchange/api/accounts/DepositIntegrationTest.java
index 8f142deb..2516ca19 100644
--- a/api/src/test/java/com/coinbase/exchange/api/accounts/DepositIntegrationTest.java
+++ b/api/src/test/java/com/coinbase/exchange/api/accounts/DepositIntegrationTest.java
@@ -3,6 +3,7 @@
 import com.coinbase.exchange.api.BaseIntegrationTest;
 import com.coinbase.exchange.api.config.IntegrationTestConfiguration;
 import com.coinbase.exchange.api.deposits.DepositService;
+import com.coinbase.exchange.api.exchange.CoinbaseExchangeException;
 import com.coinbase.exchange.api.payments.CoinbaseAccount;
 import com.coinbase.exchange.api.payments.PaymentService;
 import com.coinbase.exchange.model.PaymentResponse;
@@ -43,7 +44,7 @@ void setUp() {
     }
 
     @Test
-    public void depositToGDAXExchangeFromCoinbase(){
+    public void depositToGDAXExchangeFromCoinbase() throws CoinbaseExchangeException {
         // given
         List<CoinbaseAccount> coinbaseAccountList = paymentService.getCoinbaseAccounts();
         assertTrue(coinbaseAccountList.size() > 0);
diff --git a/api/src/test/java/com/coinbase/exchange/api/accounts/UserAccountServiceIntegrationTest.java b/api/src/test/java/com/coinbase/exchange/api/accounts/UserAccountServiceIntegrationTest.java
index fb9f61b4..8f2eb7c5 100644
--- a/api/src/test/java/com/coinbase/exchange/api/accounts/UserAccountServiceIntegrationTest.java
+++ b/api/src/test/java/com/coinbase/exchange/api/accounts/UserAccountServiceIntegrationTest.java
@@ -2,6 +2,7 @@
 
 import com.coinbase.exchange.api.BaseIntegrationTest;
 import com.coinbase.exchange.api.config.IntegrationTestConfiguration;
+import com.coinbase.exchange.api.exchange.CoinbaseExchangeException;
 import com.coinbase.exchange.api.useraccount.UserAccountData;
 import com.coinbase.exchange.api.useraccount.UserAccountService;
 import org.junit.jupiter.api.BeforeEach;
@@ -32,7 +33,7 @@ void setUp() {
      * Trailing volume could be empty so all we have to do is make sure it's not returning null
      */
     @Test
-    public void getTrailingVolume(){
+    public void getTrailingVolume() throws CoinbaseExchangeException {
         List<UserAccountData> data = userAccountService.getTrailingVolume();
         assertNotNull(data);
     }
diff --git a/api/src/test/java/com/coinbase/exchange/api/accounts/WithdrawalIntegrationTest.java b/api/src/test/java/com/coinbase/exchange/api/accounts/WithdrawalIntegrationTest.java
index 429897e0..56cc90cd 100644
--- a/api/src/test/java/com/coinbase/exchange/api/accounts/WithdrawalIntegrationTest.java
+++ b/api/src/test/java/com/coinbase/exchange/api/accounts/WithdrawalIntegrationTest.java
@@ -2,6 +2,7 @@
 
 import com.coinbase.exchange.api.BaseIntegrationTest;
 import com.coinbase.exchange.api.config.IntegrationTestConfiguration;
+import com.coinbase.exchange.api.exchange.CoinbaseExchangeException;
 import com.coinbase.exchange.api.payments.CoinbaseAccount;
 import com.coinbase.exchange.api.payments.PaymentService;
 import com.coinbase.exchange.api.payments.PaymentType;
@@ -45,7 +46,7 @@ void setUp() {
     }
 
     @Test
-    public void withdrawToCoinbaseAccount(){
+    public void withdrawToCoinbaseAccount() throws CoinbaseExchangeException {
         List<Account> gdaxAccounts = accountService.getAccounts();
         List<PaymentType> paymentTypes = paymentService.getPaymentTypes();
         List<CoinbaseAccount> coinbaseAccounts = paymentService.getCoinbaseAccounts();
diff --git a/api/src/test/java/com/coinbase/exchange/api/authentication/AuthenticationIntegrationIntegrationTest.java b/api/src/test/java/com/coinbase/exchange/api/authentication/AuthenticationIntegrationIntegrationTest.java
index 4eb3d7f7..451b9370 100644
--- a/api/src/test/java/com/coinbase/exchange/api/authentication/AuthenticationIntegrationIntegrationTest.java
+++ b/api/src/test/java/com/coinbase/exchange/api/authentication/AuthenticationIntegrationIntegrationTest.java
@@ -4,6 +4,7 @@
 import com.coinbase.exchange.api.accounts.Account;
 import com.coinbase.exchange.api.accounts.AccountService;
 import com.coinbase.exchange.api.config.IntegrationTestConfiguration;
+import com.coinbase.exchange.api.exchange.CoinbaseExchangeException;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
@@ -34,7 +35,7 @@ void setUp() {
 
     // ensure a basic request can be made. Not a great test. Improve.
     @Test
-    public void simpleAuthenticationTest(){
+    public void simpleAuthenticationTest() throws CoinbaseExchangeException {
         List<Account> accounts = accountService.getAccounts();
         assertNotNull(accounts);
         assertTrue(accounts.size() > 0);
diff --git a/api/src/test/java/com/coinbase/exchange/api/exchange/CoinbaseExchangeExceptionTest.java b/api/src/test/java/com/coinbase/exchange/api/exchange/CoinbaseExchangeExceptionTest.java
new file mode 100644
index 00000000..bcb4f119
--- /dev/null
+++ b/api/src/test/java/com/coinbase/exchange/api/exchange/CoinbaseExchangeExceptionTest.java
@@ -0,0 +1,53 @@
+package com.coinbase.exchange.api.exchange;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.Matchers.is;
+import static org.hamcrest.Matchers.nullValue;
+import static org.hamcrest.Matchers.sameInstance;
+import static org.junit.jupiter.api.Assertions.assertAll;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+import com.coinbase.exchange.api.config.IntegrationTestConfiguration;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.json.JsonTest;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.web.client.HttpClientErrorException;
+
+@JsonTest
+@ContextConfiguration(classes = IntegrationTestConfiguration.class)
+class CoinbaseExchangeExceptionTest {
+    @Autowired
+    ObjectMapper objectMapper;
+
+    @Test
+    void createBuildInstanceWithMessage() {
+        HttpClientErrorException httpException = mock(HttpClientErrorException.class);
+
+        when(httpException.getResponseBodyAsString()).thenReturn("{\"message\": \"error\"}");
+
+        CoinbaseExchangeException result = CoinbaseExchangeException.create(httpException, objectMapper);
+
+        assertAll(
+                () -> assertThat(result.getMessage(), is(equalTo("error"))),
+                () -> assertThat(result.getCause(), is(sameInstance(httpException)))
+        );
+    }
+
+    @Test
+    void createBuildInstanceWithoutMessageWhenInvalid() {
+        HttpClientErrorException httpException = mock(HttpClientErrorException.class);
+
+        when(httpException.getResponseBodyAsString()).thenReturn("{\"message\": error\"}");
+
+        CoinbaseExchangeException result = CoinbaseExchangeException.create(httpException, objectMapper);
+
+        assertAll(
+                () -> assertThat(result.getMessage(), is(nullValue())),
+                () -> assertThat(result.getCause(), is(sameInstance(httpException)))
+        );
+    }
+}
diff --git a/api/src/test/java/com/coinbase/exchange/api/marketdata/MarketDataIntegrationTest.java b/api/src/test/java/com/coinbase/exchange/api/marketdata/MarketDataIntegrationTest.java
index 72bad58b..d49835c0 100644
--- a/api/src/test/java/com/coinbase/exchange/api/marketdata/MarketDataIntegrationTest.java
+++ b/api/src/test/java/com/coinbase/exchange/api/marketdata/MarketDataIntegrationTest.java
@@ -2,6 +2,7 @@
 
 import com.coinbase.exchange.api.BaseIntegrationTest;
 import com.coinbase.exchange.api.config.IntegrationTestConfiguration;
+import com.coinbase.exchange.api.exchange.CoinbaseExchangeException;
 import com.coinbase.exchange.api.products.ProductService;
 import com.coinbase.exchange.model.Product;
 import org.junit.jupiter.api.BeforeEach;
@@ -34,14 +35,14 @@ void setUp() {
     }
 
     @Test
-    public void canGetMarketDataForLevelOneBidAndAsk() {
+    public void canGetMarketDataForLevelOneBidAndAsk() throws CoinbaseExchangeException {
         MarketData marketData = testee.getMarketDataOrderBook("BTC-GBP", 1);
         System.out.println(marketData);
         assertTrue(marketData.getSequence() > 0);
     }
 
     @Test
-    public void canGetMarketDataForLevelTwoBidAndAsk() {
+    public void canGetMarketDataForLevelTwoBidAndAsk() throws CoinbaseExchangeException {
         MarketData marketData = testee.getMarketDataOrderBook("BTC-GBP", 2);
         System.out.println(marketData);
         assertTrue(marketData.getSequence() > 0);
@@ -52,14 +53,14 @@ public void canGetMarketDataForLevelTwoBidAndAsk() {
      * order Id rather than the count of orders at a certain price.
      */
     @Test
-    public void canGetMarketDataForLevelThreeBidAndAsk() {
+    public void canGetMarketDataForLevelThreeBidAndAsk() throws CoinbaseExchangeException {
         MarketData marketData = testee.getMarketDataOrderBook("BTC-GBP", 3);
         System.out.println(marketData);
         assertTrue(marketData.getSequence() > 0);
     }
 
     @Test
-    public void canGetLevel1DataForAllProducts(){
+    public void canGetLevel1DataForAllProducts() throws CoinbaseExchangeException {
         List<Product> products = productService.getProducts();
         for(Product product : products){
             System.out.print("\nTesting: " + product.getId());
diff --git a/api/src/test/java/com/coinbase/exchange/api/marketdata/OrderItemDeserializerTest.java b/api/src/test/java/com/coinbase/exchange/api/marketdata/OrderItemDeserializerTest.java
index 1feec026..68cdc0a2 100644
--- a/api/src/test/java/com/coinbase/exchange/api/marketdata/OrderItemDeserializerTest.java
+++ b/api/src/test/java/com/coinbase/exchange/api/marketdata/OrderItemDeserializerTest.java
@@ -1,5 +1,6 @@
 package com.coinbase.exchange.api.marketdata;
 
+import com.coinbase.exchange.api.exchange.CoinbaseExchangeException;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import org.junit.jupiter.api.Test;
 
@@ -19,7 +20,7 @@ public class OrderItemDeserializerTest {
      * @throws IOException
      */
     @Test
-    public void testDesirialization() throws IOException {
+    public void testDesirialization() throws CoinbaseExchangeException, IOException {
         String test = "{\n" +
                 "    \"sequence\": \"3\",\n" +
                 "    \"bids\": [\n" +
@@ -37,4 +38,4 @@ public void testDesirialization() throws IOException {
         assertEquals(marketData.getBids().size(), 2);
         assertEquals(marketData.getSequence(), 3L);
     }
-}
\ No newline at end of file
+}
diff --git a/api/src/test/java/com/coinbase/exchange/api/orders/OrderIntegrationTest.java b/api/src/test/java/com/coinbase/exchange/api/orders/OrderIntegrationTest.java
index 71c25785..8835cbf4 100644
--- a/api/src/test/java/com/coinbase/exchange/api/orders/OrderIntegrationTest.java
+++ b/api/src/test/java/com/coinbase/exchange/api/orders/OrderIntegrationTest.java
@@ -4,6 +4,7 @@
 import com.coinbase.exchange.api.accounts.Account;
 import com.coinbase.exchange.api.accounts.AccountService;
 import com.coinbase.exchange.api.config.IntegrationTestConfiguration;
+import com.coinbase.exchange.api.exchange.CoinbaseExchangeException;
 import com.coinbase.exchange.api.marketdata.MarketData;
 import com.coinbase.exchange.api.marketdata.MarketDataService;
 import com.coinbase.exchange.api.products.ProductService;
@@ -63,7 +64,7 @@ void setUp() {
      * Note: You'll need credit available in your test account
      */
     @Ignore
-    public void canMakeLimitOrderAndGetTheOrderAndCancelIt() {
+    public void canMakeLimitOrderAndGetTheOrderAndCancelIt() throws CoinbaseExchangeException {
         List<Account> accounts = accountService.getAccounts();
         Optional<Account> accountsWithMoreThanZeroCoinsAvailable = accounts.stream()
                 .filter(account -> account.getBalance().compareTo(BigDecimal.ONE) > 0 && account.getCurrency().contains("BTC"))
@@ -101,25 +102,25 @@ public void canMakeLimitOrderAndGetTheOrderAndCancelIt() {
     }
 
     @Test
-    public void cancelAllOrders() {
+    public void cancelAllOrders() throws CoinbaseExchangeException {
         List<Order> cancelledOrders = testee.cancelAllOpenOrders();
         assertTrue(cancelledOrders.size() >= 0);
     }
 
     @Test
-    public void getAllOpenOrders() {
+    public void getAllOpenOrders() throws CoinbaseExchangeException {
         List<Order> openOrders = testee.getOpenOrders();
         assertTrue(openOrders.size() >= 0);
     }
 
     @Test
-    public void getFillsByProductId() {
+    public void getFillsByProductId() throws CoinbaseExchangeException {
         List<Fill> fills = testee.getFillsByProductId("BTC-USD", 100);
         assertTrue(fills.size() >= 0);
     }
 
     @Ignore
-    public void shouldGetFilledByOrderIdWhenMakingMarketOrderBuy() {
+    public void shouldGetFilledByOrderIdWhenMakingMarketOrderBuy() throws CoinbaseExchangeException {
         NewMarketOrderSingle marketOrder = createNewMarketOrder("BTC-USD", "buy", new BigDecimal(0.01));
         Order order = testee.createOrder(marketOrder);
 
@@ -129,7 +130,7 @@ public void shouldGetFilledByOrderIdWhenMakingMarketOrderBuy() {
     }
 
     @Ignore
-    public void createMarketOrderBuy() {
+    public void createMarketOrderBuy() throws CoinbaseExchangeException {
         NewMarketOrderSingle marketOrder = createNewMarketOrder("BTC-USD", "buy", new BigDecimal(0.01));
         Order order = testee.createOrder(marketOrder);
 
@@ -144,7 +145,7 @@ public void createMarketOrderBuy() {
     }
 
     @Ignore
-    public void createMarketOrderSell() {
+    public void createMarketOrderSell() throws CoinbaseExchangeException {
         NewMarketOrderSingle marketOrder = createNewMarketOrder("BTC-USD", "sell", new BigDecimal(0.01));
         Order order = testee.createOrder(marketOrder);
         assertNotNull(order); //make sure we created an order
@@ -165,7 +166,7 @@ private NewMarketOrderSingle createNewMarketOrder(String product, String action,
         return marketOrder;
     }
 
-    private MarketData getMarketDataOrderBook(String product) {
+    private MarketData getMarketDataOrderBook(String product) throws CoinbaseExchangeException {
         return marketDataService.getMarketDataOrderBook(product, 1);
     }
 
diff --git a/api/src/test/java/com/coinbase/exchange/api/payments/PaymentIntegrationTest.java b/api/src/test/java/com/coinbase/exchange/api/payments/PaymentIntegrationTest.java
index 9cd5a5af..020d0dfc 100644
--- a/api/src/test/java/com/coinbase/exchange/api/payments/PaymentIntegrationTest.java
+++ b/api/src/test/java/com/coinbase/exchange/api/payments/PaymentIntegrationTest.java
@@ -2,6 +2,7 @@
 
 import com.coinbase.exchange.api.BaseIntegrationTest;
 import com.coinbase.exchange.api.config.IntegrationTestConfiguration;
+import com.coinbase.exchange.api.exchange.CoinbaseExchangeException;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
@@ -24,12 +25,12 @@ void setUp() {
     }
 
     @Test
-    public void hasAvailablePayments(){
+    public void hasAvailablePayments() throws CoinbaseExchangeException {
         List<PaymentType> types = testee.getPaymentTypes();
         assertTrue(types.size() > 0);
     }
     @Test
-    public void hasCoinbaseAccounts(){
+    public void hasCoinbaseAccounts() throws CoinbaseExchangeException {
         List<CoinbaseAccount> accounts = testee.getCoinbaseAccounts();
         assertTrue(accounts.size() > 0);
     }
diff --git a/api/src/test/java/com/coinbase/exchange/api/products/ProductsIntegrationTest.java b/api/src/test/java/com/coinbase/exchange/api/products/ProductsIntegrationTest.java
index 04f59e08..e0b9237a 100644
--- a/api/src/test/java/com/coinbase/exchange/api/products/ProductsIntegrationTest.java
+++ b/api/src/test/java/com/coinbase/exchange/api/products/ProductsIntegrationTest.java
@@ -2,6 +2,7 @@
 
 import com.coinbase.exchange.api.BaseIntegrationTest;
 import com.coinbase.exchange.api.config.IntegrationTestConfiguration;
+import com.coinbase.exchange.api.exchange.CoinbaseExchangeException;
 import com.coinbase.exchange.model.Candles;
 import com.coinbase.exchange.model.Granularity;
 import com.coinbase.exchange.model.Product;
@@ -44,21 +45,21 @@ void setUp() {
     }
 
     @Test
-    public void canGetProducts() {
+    public void canGetProducts() throws CoinbaseExchangeException {
         List<Product> products = productService.getProducts();
         products.forEach(item -> System.out.println(item.getId()));
         assertTrue(products.size() >= 0);
     }
 
     @Test
-    void shouldGetCandles() {
+    void shouldGetCandles() throws CoinbaseExchangeException {
         Candles candles = productService.getCandles(TEST_PRODUCT_ID);
 
         assertEquals(300, candles.getCandleList().size());
     }
 
     @Test
-    void shouldGetCandlesForAGanularityOf_OneDay() {
+    void shouldGetCandlesForAGanularityOf_OneDay() throws CoinbaseExchangeException {
         Candles candles = productService.getCandles(TEST_PRODUCT_ID, Granularity.ONE_DAY);
 
         assertEquals(300, candles.getCandleList().size());
@@ -66,7 +67,7 @@ void shouldGetCandlesForAGanularityOf_OneDay() {
     }
 
     @Test
-    void shouldGetCandlesForAGanularityOf_SixHours() {
+    void shouldGetCandlesForAGanularityOf_SixHours() throws CoinbaseExchangeException {
         Candles candles = productService.getCandles(TEST_PRODUCT_ID, Granularity.SIX_HOURS);
 
         assertEquals(300, candles.getCandleList().size());
@@ -74,7 +75,7 @@ void shouldGetCandlesForAGanularityOf_SixHours() {
     }
 
     @Test
-    void shouldGetCandlesForAGanularityOf_OneHour() {
+    void shouldGetCandlesForAGanularityOf_OneHour() throws CoinbaseExchangeException {
         Candles candles = productService.getCandles(TEST_PRODUCT_ID, Granularity.ONE_HOUR);
 
         assertEquals(300, candles.getCandleList().size());
@@ -82,7 +83,7 @@ void shouldGetCandlesForAGanularityOf_OneHour() {
     }
 
     @Test
-    void shouldGetCandlesForAGanularityOf_FifteenMins() {
+    void shouldGetCandlesForAGanularityOf_FifteenMins() throws CoinbaseExchangeException {
         Candles candles = productService.getCandles(TEST_PRODUCT_ID, Granularity.FIFTEEN_MIN);
 
         assertEquals(300, candles.getCandleList().size());
@@ -90,7 +91,7 @@ void shouldGetCandlesForAGanularityOf_FifteenMins() {
     }
 
     @Test
-    void shouldGetCandlesForAGanularityOf_FiveMins() {
+    void shouldGetCandlesForAGanularityOf_FiveMins() throws CoinbaseExchangeException {
         Candles candles = productService.getCandles(TEST_PRODUCT_ID, Granularity.FIVE_MIN);
 
         assertEquals(300, candles.getCandleList().size());
@@ -98,7 +99,7 @@ void shouldGetCandlesForAGanularityOf_FiveMins() {
     }
 
     @Test
-    void shouldGetCandlesForAGanularityOf_OneMin() {
+    void shouldGetCandlesForAGanularityOf_OneMin() throws CoinbaseExchangeException {
         Candles candles = productService.getCandles(TEST_PRODUCT_ID, Granularity.ONE_MIN);
 
         assertEquals(300, candles.getCandleList().size());
@@ -106,7 +107,7 @@ void shouldGetCandlesForAGanularityOf_OneMin() {
     }
 
     @Test
-    void shouldGetCandlesForWithAStartAndEndTime() {
+    void shouldGetCandlesForWithAStartAndEndTime() throws CoinbaseExchangeException {
         Instant startTime = Instant.now().minus(400, ChronoUnit.DAYS);
         Instant endTime = Instant.now().minus(100, ChronoUnit.DAYS);
 
diff --git a/build.gradle b/build.gradle
index b7fe9f3f..9eef8bef 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,14 +1,7 @@
-buildscript {
-    repositories {
-        jcenter()
-    }
-    dependencies {
-        classpath 'com.github.jengelman.gradle.plugins:shadow:5.1.0'
-    }
+plugins {
+    id 'com.github.johnrengelman.shadow' version '6.1.0'
 }
 
-apply plugin: 'com.github.johnrengelman.shadow'
-
 wrapper {
     distributionType = Wrapper.DistributionType.ALL
 }
@@ -36,48 +29,18 @@ allprojects {
     }
 }
 
-subprojects { }
-
-// apply dependency constraints to all java modules
-configure(subprojects.findAll { true }) {
-
-    sourceCompatibility = 1.11
-    targetCompatibility = 1.11
+subprojects {
+    sourceCompatibility = JavaVersion.VERSION_11
+    targetCompatibility = JavaVersion.VERSION_11
 
     dependencies {
-        constraints {
-            implementation 'com.fasterxml.jackson.core:jackson-core:2.11.0'
-            implementation 'com.fasterxml.jackson.core:jackson-databind:2.11.0'
-            implementation 'com.fasterxml.jackson.core:jackson-annotations:2.11.0'
-            implementation 'com.fasterxml.jackson.datatype:jackson-datatype-jdk8:2.11.0'
-            implementation 'com.fasterxml.jackson.datatype:jackson-datatype-jsr310:2.11.0'
-            implementation 'org.slf4j:slf4j-api:1.7.28'
-            implementation 'ch.qos.logback:logback-classic:1.2.3'
-            implementation 'ch.qos.logback:logback-core:1.2.3'
-            implementation 'org.springframework.boot:spring-boot-starter-web:2.2.7.RELEASE'
-            implementation 'org.springframework:spring-context:5.2.6.RELEASE'
-
-            // --------------------------------------
-            testImplementation 'junit:junit:4.12'
-            testImplementation 'org.junit.jupiter:junit-jupiter-api:5.5.2'
-            testImplementation 'org.junit.jupiter:junit-jupiter-params:5.5.2'
-            testImplementation 'org.junit.jupiter:junit-jupiter-engine:5.5.2'
-            testImplementation 'org.junit.platform:junit-platform-suite-api:1.3.2'
-
-            testImplementation 'org.springframework.boot:spring-boot-test:2.2.7.RELEASE'
-            testImplementation 'org.springframework.boot:spring-boot-starter-test:2.2.7.RELEASE'
-
-            testImplementation 'org.mockito:mockito-core:3.0.0'
-            testImplementation 'org.mockito:mockito-junit-jupiter:3.0.0'
-
-            testImplementation 'org.assertj:assertj-core:3.13.2'
-        }
+        implementation platform('org.springframework.boot:spring-boot-dependencies:2.4.3')
     }
 }
 
 dependencies {
-    compile project(":api")
-    compile project(":model")
-    compile project(":security")
-    compile project(":websocketfeed")
+    implementation project(":api")
+    implementation project(":model")
+    implementation project(":security")
+    implementation project(":websocketfeed")
 }
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
index e3e27e60..5c2d1cf0 100644
Binary files a/gradle/wrapper/gradle-wrapper.jar and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index a0bb991a..8cf6eb5a 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,5 @@
-#Fri Jan 20 14:01:00 GMT 2017
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.8.3-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.3.1-all.zip
diff --git a/gradlew b/gradlew
index 4453ccea..b0d6d0ab 100755
--- a/gradlew
+++ b/gradlew
@@ -1,5 +1,21 @@
 #!/usr/bin/env sh
 
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
 ##############################################################################
 ##
 ##  Gradle start up script for UN*X
@@ -28,16 +44,16 @@ APP_NAME="Gradle"
 APP_BASE_NAME=`basename "$0"`
 
 # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-DEFAULT_JVM_OPTS=""
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD="maximum"
 
-warn ( ) {
+warn () {
     echo "$*"
 }
 
-die ( ) {
+die () {
     echo
     echo "$*"
     echo
@@ -155,7 +171,7 @@ if $cygwin ; then
 fi
 
 # Escape application args
-save ( ) {
+save () {
     for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
     echo " "
 }
diff --git a/gradlew.bat b/gradlew.bat
index e95643d6..15e1ee37 100644
--- a/gradlew.bat
+++ b/gradlew.bat
@@ -1,3 +1,19 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      http://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
 @if "%DEBUG%" == "" @echo off
 @rem ##########################################################################
 @rem
@@ -14,7 +30,7 @@ set APP_BASE_NAME=%~n0
 set APP_HOME=%DIRNAME%
 
 @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-set DEFAULT_JVM_OPTS=
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
 
 @rem Find java.exe
 if defined JAVA_HOME goto findJavaFromJavaHome
diff --git a/model/src/main/java/com/coinbase/exchange/model/Candle.java b/model/src/main/java/com/coinbase/exchange/model/Candle.java
index 97652ec0..fe15a5d2 100644
--- a/model/src/main/java/com/coinbase/exchange/model/Candle.java
+++ b/model/src/main/java/com/coinbase/exchange/model/Candle.java
@@ -13,20 +13,22 @@ public class Candle {
     private BigDecimal volume;
 
     public Candle(String[] entry) {
-        this(Instant.ofEpochSecond(Long.parseLong(entry[0])),
+        this(
+                Instant.ofEpochSecond(Long.parseLong(entry[0])),
                 new BigDecimal(entry[1]),
                 new BigDecimal(entry[2]),
                 new BigDecimal(entry[3]),
                 new BigDecimal(entry[4]),
-                new BigDecimal(entry[5]));
+                new BigDecimal(entry[5])
+        );
     }
 
     public Candle(Instant time, BigDecimal low, BigDecimal high, BigDecimal open, BigDecimal close, BigDecimal volume) {
-        this.time   = time;
-        this.low    = low;
-        this.high   = high;
-        this.open   = open;
-        this.close  = close;
+        this.time = time;
+        this.low = low;
+        this.high = high;
+        this.open = open;
+        this.close = close;
         this.volume = volume;
     }
 
@@ -77,4 +79,16 @@ public void setClose(BigDecimal close) {
     public void setVolume(BigDecimal volume) {
         this.volume = volume;
     }
+
+    @Override
+    public String toString() {
+        return "Candle{"
+                + "time=" + time
+                + ", low=" + low
+                + ", high=" + high
+                + ", open=" + open
+                + ", close=" + close
+                + ", volume=" + volume
+                + '}';
+    }
 }
diff --git a/model/src/main/java/com/coinbase/exchange/model/Candles.java b/model/src/main/java/com/coinbase/exchange/model/Candles.java
index 4f73ff41..0cae643a 100644
--- a/model/src/main/java/com/coinbase/exchange/model/Candles.java
+++ b/model/src/main/java/com/coinbase/exchange/model/Candles.java
@@ -14,4 +14,11 @@ public Candles(List<String[]> candles) {
     public List<Candle> getCandleList() {
         return candleList;
     }
+
+    @Override
+    public String toString() {
+        return "Candles{"
+                + "candleList=" + candleList
+                + '}';
+    }
 }
diff --git a/model/src/main/java/com/coinbase/exchange/model/CoinbasePaymentRequest.java b/model/src/main/java/com/coinbase/exchange/model/CoinbasePaymentRequest.java
index aff6e5aa..96bcb4f3 100644
--- a/model/src/main/java/com/coinbase/exchange/model/CoinbasePaymentRequest.java
+++ b/model/src/main/java/com/coinbase/exchange/model/CoinbasePaymentRequest.java
@@ -16,10 +16,22 @@ public CoinbasePaymentRequest(BigDecimal amount, String currency, String coinbas
         this.payment_method_id = coinbase_account_id; //Duplicated field for gdax compliance, I believe
         //We could probably remove coinbase_account_id but there are no tests for this specific thing
     }
+
     public String getCoinbase_account_id() {
         return coinbase_account_id;
     }
+
     public void setCoinbase_account_id(String coinbase_account_id) {
         this.coinbase_account_id = coinbase_account_id;
     }
+
+    @Override
+    public String toString() {
+        return "CoinbasePaymentRequest{"
+                + "coinbase_account_id='" + coinbase_account_id + '\''
+                + ", payment_method_id='" + payment_method_id + '\''
+                + ", amount=" + amount
+                + ", currency='" + currency + '\''
+                + '}';
+    }
 }
diff --git a/model/src/main/java/com/coinbase/exchange/model/CryptoPaymentRequest.java b/model/src/main/java/com/coinbase/exchange/model/CryptoPaymentRequest.java
index fcca671c..708396c2 100644
--- a/model/src/main/java/com/coinbase/exchange/model/CryptoPaymentRequest.java
+++ b/model/src/main/java/com/coinbase/exchange/model/CryptoPaymentRequest.java
@@ -9,10 +9,21 @@ public CryptoPaymentRequest(BigDecimal amount, String currency, String cryptoAdd
         super(amount, currency);
         this.crypto_address = cryptoAddress;
     }
+
     public String getCryptoAddress() {
         return crypto_address;
     }
+
     public void setCryptoAddress(String cryptoAddress) {
         this.crypto_address = cryptoAddress;
     }
+
+    @Override
+    public String toString() {
+        return "CryptoPaymentRequest{"
+                + "crypto_address='" + crypto_address + '\''
+                + ", amount=" + amount
+                + ", currency='" + currency + '\''
+                + '}';
+    }
 }
diff --git a/model/src/main/java/com/coinbase/exchange/model/Currency.java b/model/src/main/java/com/coinbase/exchange/model/Currency.java
index 8337af75..30585cf9 100644
--- a/model/src/main/java/com/coinbase/exchange/model/Currency.java
+++ b/model/src/main/java/com/coinbase/exchange/model/Currency.java
@@ -3,6 +3,7 @@
 import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 
 import java.math.BigDecimal;
+import java.util.Arrays;
 
 @JsonIgnoreProperties(ignoreUnknown = true)
 public class Currency {
@@ -103,4 +104,19 @@ public Object getDetails() {
     public void setDetails(Object details) {
         this.details = details;
     }
+
+    @Override
+    public String toString() {
+        return "Currency{"
+                + "id='" + id + '\''
+                + ", name='" + name + '\''
+                + ", min_size=" + min_size
+                + ", status='" + status + '\''
+                + ", status_message='" + status_message + '\''
+                + ", max_precision=" + max_precision
+                + ", convertible_to=" + Arrays.toString(convertible_to)
+                + ", funding_account_id='" + funding_account_id + '\''
+                + ", details=" + details
+                + '}';
+    }
 }
diff --git a/model/src/main/java/com/coinbase/exchange/model/Detail.java b/model/src/main/java/com/coinbase/exchange/model/Detail.java
index 70298865..34ac98b4 100644
--- a/model/src/main/java/com/coinbase/exchange/model/Detail.java
+++ b/model/src/main/java/com/coinbase/exchange/model/Detail.java
@@ -31,4 +31,13 @@ public String getProduct_id() {
     public void setProduct_id(String product_id) {
         this.product_id = product_id;
     }
+
+    @Override
+    public String toString() {
+        return "Detail{"
+                + "order_id='" + order_id + '\''
+                + ", trade_id=" + trade_id
+                + ", product_id='" + product_id + '\''
+                + '}';
+    }
 }
diff --git a/model/src/main/java/com/coinbase/exchange/model/Fill.java b/model/src/main/java/com/coinbase/exchange/model/Fill.java
index d2d6b312..6453144c 100644
--- a/model/src/main/java/com/coinbase/exchange/model/Fill.java
+++ b/model/src/main/java/com/coinbase/exchange/model/Fill.java
@@ -1,6 +1,7 @@
 package com.coinbase.exchange.model;
 
 import java.math.BigDecimal;
+import java.time.Instant;
 
 /**
  * Created by irufus on 2/18/15.
@@ -8,9 +9,10 @@
 public class Fill {
     private Integer trade_id;
     private String product_id;
+    private BigDecimal price;
     private BigDecimal size;
     private String order_id;
-    private String created_at;
+    private Instant created_at;
     private String liquidity;
     private BigDecimal fee;
     private Boolean settled;
@@ -40,11 +42,11 @@ public void setFee(BigDecimal fee) {
         this.fee = fee;
     }
 
-    public String getCreated_at() {
+    public Instant getCreated_at() {
         return created_at;
     }
 
-    public void setCreated_at(String created_at) {
+    public void setCreated_at(Instant created_at) {
         this.created_at = created_at;
     }
 
@@ -87,4 +89,28 @@ public Integer getTrade_id() {
     public void setTrade_id(Integer trade_id) {
         this.trade_id = trade_id;
     }
+
+    public BigDecimal getPrice() {
+        return price;
+    }
+
+    public void setPrice(final BigDecimal price) {
+        this.price = price;
+    }
+
+    @Override
+    public String toString() {
+        return "Fill{"
+                + "trade_id=" + trade_id
+                + ", product_id='" + product_id + '\''
+                + ", price=" + price
+                + ", size=" + size
+                + ", order_id='" + order_id + '\''
+                + ", created_at=" + created_at
+                + ", liquidity='" + liquidity + '\''
+                + ", fee=" + fee
+                + ", settled=" + settled
+                + ", side='" + side + '\''
+                + '}';
+    }
 }
diff --git a/model/src/main/java/com/coinbase/exchange/model/Granularity.java b/model/src/main/java/com/coinbase/exchange/model/Granularity.java
index 63696e3e..60798a27 100644
--- a/model/src/main/java/com/coinbase/exchange/model/Granularity.java
+++ b/model/src/main/java/com/coinbase/exchange/model/Granularity.java
@@ -29,4 +29,11 @@ public String get(){
         }
         return "";
     }
+
+    @Override
+    public String toString() {
+        return "Granularity{"
+                + "granularity='" + granularity + '\''
+                + '}';
+    }
 }
diff --git a/model/src/main/java/com/coinbase/exchange/model/Hold.java b/model/src/main/java/com/coinbase/exchange/model/Hold.java
index 70bb0ec4..9fb6065e 100644
--- a/model/src/main/java/com/coinbase/exchange/model/Hold.java
+++ b/model/src/main/java/com/coinbase/exchange/model/Hold.java
@@ -82,4 +82,17 @@ public String getRef() {
     public void setRef(String ref) {
         this.ref = ref;
     }
+
+    @Override
+    public String toString() {
+        return "Hold{"
+                + "id='" + id + '\''
+                + ", account_id='" + account_id + '\''
+                + ", created_at='" + created_at + '\''
+                + ", update_at='" + update_at + '\''
+                + ", amount=" + amount
+                + ", type='" + type + '\''
+                + ", ref='" + ref + '\''
+                + '}';
+    }
 }
diff --git a/model/src/main/java/com/coinbase/exchange/model/NewLimitOrderSingle.java b/model/src/main/java/com/coinbase/exchange/model/NewLimitOrderSingle.java
index dbb61980..3b0bd356 100644
--- a/model/src/main/java/com/coinbase/exchange/model/NewLimitOrderSingle.java
+++ b/model/src/main/java/com/coinbase/exchange/model/NewLimitOrderSingle.java
@@ -62,4 +62,18 @@ public void setSize(BigDecimal size) {
         this.size = size;
     }
 
+    @Override
+    public String toString() {
+        return "NewLimitOrderSingle{"
+                + "size=" + size
+                + ", price=" + price
+                + ", post_only=" + post_only
+                + ", client_oid='" + client_oid + '\''
+                + ", type='" + type + '\''
+                + ", side='" + side + '\''
+                + ", product_id='" + product_id + '\''
+                + ", stp='" + stp + '\''
+                + ", funds='" + funds + '\''
+                + '}';
+    }
 }
diff --git a/model/src/main/java/com/coinbase/exchange/model/NewMarketOrderSingle.java b/model/src/main/java/com/coinbase/exchange/model/NewMarketOrderSingle.java
index 135d0841..ffce6ef3 100644
--- a/model/src/main/java/com/coinbase/exchange/model/NewMarketOrderSingle.java
+++ b/model/src/main/java/com/coinbase/exchange/model/NewMarketOrderSingle.java
@@ -25,4 +25,16 @@ public void setSize(BigDecimal size) {
         this.size = size;
     }
 
+    @Override
+    public String toString() {
+        return "NewMarketOrderSingle{"
+                + "size=" + size
+                + ", client_oid='" + client_oid + '\''
+                + ", type='" + type + '\''
+                + ", side='" + side + '\''
+                + ", product_id='" + product_id + '\''
+                + ", stp='" + stp + '\''
+                + ", funds='" + funds + '\''
+                + '}';
+    }
 }
diff --git a/model/src/main/java/com/coinbase/exchange/model/NewOrderSingle.java b/model/src/main/java/com/coinbase/exchange/model/NewOrderSingle.java
index a50334d8..c364913c 100644
--- a/model/src/main/java/com/coinbase/exchange/model/NewOrderSingle.java
+++ b/model/src/main/java/com/coinbase/exchange/model/NewOrderSingle.java
@@ -24,12 +24,12 @@
  */
 public abstract class NewOrderSingle {
 
-    private String client_oid; //optional
-    private String type; //default is limit, other types are market and stop
-    private String side;
-    private String product_id;
-    private String stp; //optional: values are dc, co , cn , cb
-    private String funds;
+    protected String client_oid; //optional
+    protected String type; //default is limit, other types are market and stop
+    protected String side;
+    protected String product_id;
+    protected String stp; //optional: values are dc, co , cn , cb
+    protected String funds;
 
     public NewOrderSingle() {
     }
diff --git a/model/src/main/java/com/coinbase/exchange/model/PaymentRequest.java b/model/src/main/java/com/coinbase/exchange/model/PaymentRequest.java
index 33da49f5..83847b39 100644
--- a/model/src/main/java/com/coinbase/exchange/model/PaymentRequest.java
+++ b/model/src/main/java/com/coinbase/exchange/model/PaymentRequest.java
@@ -20,4 +20,13 @@ public String getPayment_method_id() {
     public void setPayment_method_id(String payment_method_id) {
         this.payment_method_id = payment_method_id;
     }
+
+    @Override
+    public String toString() {
+        return "PaymentRequest{"
+                + "amount=" + amount
+                + ", currency='" + currency + '\''
+                + ", payment_method_id='" + payment_method_id + '\''
+                + '}';
+    }
 }
diff --git a/model/src/main/java/com/coinbase/exchange/model/PaymentResponse.java b/model/src/main/java/com/coinbase/exchange/model/PaymentResponse.java
index 317057dd..2b8bbc5b 100644
--- a/model/src/main/java/com/coinbase/exchange/model/PaymentResponse.java
+++ b/model/src/main/java/com/coinbase/exchange/model/PaymentResponse.java
@@ -52,4 +52,14 @@ public String getPayout_at() {
     public void setPayout_at(String payout_at) {
         this.payout_at = payout_at;
     }
+
+    @Override
+    public String toString() {
+        return "PaymentResponse{"
+                + "id='" + id + '\''
+                + ", amount=" + amount
+                + ", currency='" + currency + '\''
+                + ", payout_at='" + payout_at + '\''
+                + '}';
+    }
 }
diff --git a/model/src/main/java/com/coinbase/exchange/model/Product.java b/model/src/main/java/com/coinbase/exchange/model/Product.java
index 81fcd1f2..2f4e16d6 100644
--- a/model/src/main/java/com/coinbase/exchange/model/Product.java
+++ b/model/src/main/java/com/coinbase/exchange/model/Product.java
@@ -182,4 +182,27 @@ public String getType() {
     public void setType(String type) {
         this.type = type;
     }
+
+    @Override
+    public String toString() {
+        return "Product{"
+                + "id='" + id + '\''
+                + ", base_currency='" + base_currency + '\''
+                + ", quote_currency='" + quote_currency + '\''
+                + ", base_min_size=" + base_min_size
+                + ", base_max_size=" + base_max_size
+                + ", quote_increment=" + quote_increment
+                + ", base_increment=" + base_increment
+                + ", display_name='" + display_name + '\''
+                + ", status='" + status + '\''
+                + ", margin_enabled=" + margin_enabled
+                + ", status_message='" + status_message + '\''
+                + ", min_market_funds=" + min_market_funds
+                + ", max_market_funds=" + max_market_funds
+                + ", post_only=" + post_only
+                + ", limit_only=" + limit_only
+                + ", cancel_only=" + cancel_only
+                + ", type='" + type + '\''
+                + '}';
+    }
 }
diff --git a/model/src/main/java/com/coinbase/exchange/model/ProductOrderBook.java b/model/src/main/java/com/coinbase/exchange/model/ProductOrderBook.java
index d3eb524e..7b826acf 100644
--- a/model/src/main/java/com/coinbase/exchange/model/ProductOrderBook.java
+++ b/model/src/main/java/com/coinbase/exchange/model/ProductOrderBook.java
@@ -34,4 +34,13 @@ public Integer getSequence() {
     public void setSequence(Integer sequence) {
         this.sequence = sequence;
     }
+
+    @Override
+    public String toString() {
+        return "ProductOrderBook{"
+                + "sequence=" + sequence
+                + ", bids=" + bids
+                + ", asks=" + asks
+                + '}';
+    }
 }
diff --git a/security/build.gradle b/security/build.gradle
index 7434b167..4db7f46e 100644
--- a/security/build.gradle
+++ b/security/build.gradle
@@ -1,14 +1,3 @@
-plugins {
-    id 'java'
-}
-
-group 'com.coinbase.exchange'
-version '0.11.0'
-
-repositories {
-    mavenCentral()
-}
-
 dependencies {
-    testCompile group: 'junit', name: 'junit', version: '4.12'
+    testImplementation 'junit:junit'
 }
diff --git a/settings.gradle b/settings.gradle
index e541e8ac..d00f4bd5 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -1,8 +1,7 @@
 rootProject.name = 'coinbase-pro-java'
 
 include 'api'
-include 'security'
-include 'websocketfeed'
 include 'model'
 include 'security'
+include 'websocketfeed'
 
diff --git a/websocketfeed/build.gradle b/websocketfeed/build.gradle
index af853bd1..d608ffd9 100644
--- a/websocketfeed/build.gradle
+++ b/websocketfeed/build.gradle
@@ -1,6 +1,6 @@
 dependencies {
-    compile project(':model')
-    compile project(':security')
+    implementation project(':model')
+    implementation project(':security')
     implementation 'org.springframework.boot:spring-boot-starter-web'
     implementation 'com.fasterxml.jackson.core:jackson-core'
     implementation 'com.fasterxml.jackson.core:jackson-databind'