Multichain Verification

For repeated or multichain contract verification, it's best to use the Verify Contract endpoint to automate source code submission 🐇.

You may specify a chainId along with an Etherscan API key to submit verification for any Etherscan-like explorer

1. Using the Verify Contract Endpoint

In Postman, set your request method to HTTP POST and your URL to https://api.etherscan.io/api .

Under the Body tab and using form-data, specify the "module" to contract and "action" to verifysourcecode.

All API based verification must be authenticated, include your Etherscan API key under the "apikey" field.

2. Specify Your chainId

Select the chain you've deployed your contract, which is supported by an Etherscan-like explorer.

Specify it under the "chainId" parameter, such as 1 for Ethereum and 8453 for Base.

3. Add Contract Source Code

We support 2 formats, solidity-single-file or solidity-standard-json-input.

Using JSON is the gold standard ✨ for verification, as you can include compiler settings and multiple files ( if you use imports such as from OpenZeppelin ).

Paste your source code under "sourceCode" and the code format under the "codeformat" parameter.

Optionally if your contract uses constructor arguments, you may specify them too under the "constructorArguments" parameter in ABI encoded format.

4. Add Contract Metadata

Include the contract address as "contractaddress", beginning with "0x".

Specify your contract file path and contract name separated by a colon as "contractname", such as "contracts/Verified.sol:Verified".

Select the compiler version used from this list as your "compilerversion".

5. Submitting Verification

Click Send and you'll receive a guid which you can then check on your verification status.

Alternatively if everything went well, you'll see the happy green checkmark on your contract code ✅