The API Key field is optional. The key is used for the Get Contract ABI action, you can use it without key while you are building and testing your app, but for production it is recommended to get a key because there is a rate limit and on some networks is not even possible to use the call without the key.

The key is free and can be created on Etherscan.io, it can be used for the Kovan, Rinkeby, Ropsten, and Goerli Testnets.
For Binance Smart Chain, use bscscan. Signup and in the profile dashboard find the API key section. Generate a key, and insert it in the plugin settings.
You can find it in the Installed Plugins section.
Last modified 1yr ago
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