How do I add an API key to etherscan?

Once logged into your Etherscan account, navigate to etherscan.io/myapikey in your profile. Click on the "+ Add" button to create a new API key. Once you've created your API key, you can use it to call the free API endpoints and power your dapps with rich data.

What APIs does etherscan provide?

On Etherscan, we provide an array of APIs for data pertaining to transactions, contracts, accounts, stats and other components of the Ethereum blockchain. For the full list of our currently available APIs, kindly refer here. You must be a registered Etherscan user with your own API keys to use the APIs.

Can I Delete my etherscan API keys?

Each Etherscan account is limited to only 3 API keys and they cannot be deleted by the user. The API keys created on Etherscan.io can also be used for the Kovan, Rinkeby, Ropsten, and Goerli Testnets. Source attribution via a link back or mention that your app is "Powered by Etherscan.io APIs" is required except for personal/private usage.