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Verifying Contracts

1

Get an Etherscan API key

Follow the Etherscan documentation to get an API key.
2

Update Hardhat configuration

Add the below etherscan configuration object to your Hardhat configuration file.Replace <your-etherscan-api-key-here> with your Etherscan API key from the previous step.
hardhat.config.ts
import { HardhatUserConfig } from "hardhat/config";
import "@matterlabs/hardhat-zksync";

const config: HardhatUserConfig = {
  etherscan: {
    apiKey: {
      abstractTestnet: "your-etherscan-api-key-here",
      abstractMainnet: "your-etherscan-api-key-here",
    },
    customChains: [
      {
        network: "abstractTestnet",
        chainId: 11124,
        urls: {
          apiURL: 'https://api.etherscan.io/v2/api',
          browserURL: "https://sepolia.abscan.org/",
        },
      },
      {
        network: "abstractMainnet",
        chainId: 2741,
        urls: {
          apiURL: 'https://api.etherscan.io/v2/api',
          browserURL: "https://abscan.org/",
        },
      },
    ],
  },
};

export default config;
3

Verify a contract

Run the following command to verify a contract:
npx hardhat verify --network abstractTestnet <contract-address>
Replace <contract-address> with the address of the contract you want to verify.

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Constructor Arguments

To verify a contract with constructor arguments, pass the constructor arguments to the verify command after the contract address. 
npx hardhat verify --network abstractTestnet <contract-address> <constructor-arguments>