fix:fixing polygon testnet details

[sanketsaagar]

Description

• The polygon testnet network details was wrongly configured. It was giving mumbai but the mumbai network was deprecated 2 years ago.
• Changes made to amoy network which is the current testnet for polygon.

[cb-heimdall]

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[phdargen]

Suggested change

	"http": ["https://polygon-amoy-bor-rpc.publicnode.com"],
	"http": ["https://rpc-amoy.polygon.technology"],

[phdargen]

Suggested change

	"api_url": "https://api.etherscan.io/v2/api",
	"api_url": "https://api-amoy.polygonscan.com/api",

[phdargen]

please revert

[phdargen]

Hi @sanketsaagar, thanks for the update! Could you please align url/apiUrl with what is used in viem: https://github.com/wevm/viem/blob/main/src/chains/definitions/polygonAmoy.ts?

[phdargen]

Thanks for the update @sanketsaagar, please also change the api_urls as mentioned above

[sanketsaagar]

Thanks for the update @sanketsaagar, please also change the api_urls as mentioned above

Hey @phdargen , As of August 15th, 2025, the legacy Etherscan API V1 endpoints have been deprecated in favor of the new Etherscan API V2, which introduces a unified multichain experience across 60+ supported networks.

That means we now have to use https://api.etherscan.io/v2/api as your base path, and include a chainid for your target network (e.g., 1 for Ethereum).

So just to give you an example for polygon it should look like
https://api.etherscan.io/v2/api?chainid=137&action=balance&apikey=YourEtherscanApiKey

And for Amoy it should look like
https://api.etherscan.io/v2/api?chainid=80002&action=balance&apikey=YourEtherscanApiKey

You can read more here. I will be raising PR at viem as well to update the details. Thanks for sharing that with me.

[phdargen]

Thanks for the update @sanketsaagar, please also change the api_urls as mentioned above

Hey @phdargen , As of August 15th, 2025, the legacy Etherscan API V1 endpoints have been deprecated in favor of the new Etherscan API V2, which introduces a unified multichain experience across 60+ supported networks.

That means we now have to use https://api.etherscan.io/v2/api as your base path, and include a chainid for your target network (e.g., 1 for Ethereum).

So just to give you an example for polygon it should look like https://api.etherscan.io/v2/api?chainid=137&action=balance&apikey=YourEtherscanApiKey

And for Amoy it should look like https://api.etherscan.io/v2/api?chainid=80002&action=balance&apikey=YourEtherscanApiKey

You can read more here. I will be raising PR at viem as well to update the details. Thanks for sharing that with me.

Oh I see, thanks for the info @sanketsaagar!

[sanketsaagar]

Hey @phdargen , the apiUrl is fixed here. Just FYI.

[phdargen]

Hi @sanketsaagar, sorry just noticed the unit tests are failing.

Could you please also update polygon-mumbai in this file: python/coinbase-agentkit/coinbase_agentkit/network/init.py
and then make sure all tests pass before commiting?

cd python/coinbase-agentkit
make test

[phdargen]

Please also add a changelog as described here: https://github.com/coinbase/agentkit/blob/main/CONTRIBUTING-PYTHON.md#changelog

[phdargen]

Thanks for the update @sanketsaagar, seems something went wrong with the changelog as it was added to the repository root.

Could you please remove .changes/882.fixed.md again

and then run towncrier from python/coinbase-agentkit as described here: https://github.com/coinbase/agentkit/blob/main/CONTRIBUTING-PYTHON.md#changelog

and run changeset from 'typescript' as described here:
https://github.com/coinbase/agentkit/blob/main/CONTRIBUTING-TYPESCRIPT.md#changelog

This should create the changelogs in the correct file locations

[cb-heimdall]

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