hardhat.config.js

require("@nomicfoundation/hardhat-toolbox");
require('dotenv').config();
require("@nomicfoundation/hardhat-verify");

/** @type import('hardhat/config').HardhatUserConfig */

task("accounts", "Prints the list of accounts", async () => {
  const accounts = await ethers.getSigners();
  
  for (const account of accounts) {
    console.log(account.address);
  }
});
function mnemonic() {
  
  return process.env.PRIVATE_KEY
  
}

/**
 * @type import('hardhat/config').HardhatUserConfig
 */
module.exports = {
  solidity: {
    compilers: [
      {
        version: "0.6.6"
      },
      {
        version: "0.8.7",
        settings: {}
      }
    ]
  },
  
  networks: {
    localhost: {
      url: "http://localhost:8545",
      //gasPrice: 125000000000,//you can adjust gasPrice locally to see how much it will cost on production
      /*
        notice no mnemonic here? it will just use account 0 of the hardhat node to deploy
        (you can put in a mnemonic here to set the deployer locally)
      */
    },
    sepolia: {
      url: 'https://sepolia.infura.io/v3/' + process.env.INFURA_ID, //<---- CONFIG YOUR INFURA ID IN .ENV! (or it won't work)
      accounts: [mnemonic()],
      chainId: 11155111,
    },
    mainnet: {
      url: "https://mainnet.infura.io/v3/" + process.env.INFURA_ID, //<---- YOUR INFURA ID! (or it won't work)
      accounts: [
        mnemonic()
      ],
    },
  },
  etherscan: {
    apiKey: process.env.APIKEY
  }
};