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/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/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/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/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/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/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/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/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..5063a432 100644
--- a/model/src/main/java/com/coinbase/exchange/model/Fill.java
+++ b/model/src/main/java/com/coinbase/exchange/model/Fill.java
@@ -87,4 +87,19 @@ public Integer getTrade_id() {
     public void setTrade_id(Integer trade_id) {
         this.trade_id = trade_id;
     }
+
+    @Override
+    public String toString() {
+        return "Fill{"
+                + "trade_id=" + trade_id
+                + ", product_id='" + product_id + '\''
+                + ", 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
+                + '}';
+    }
 }