Error: could not detect network (event="noNetwork", code=NETWORK_ERROR, version=providers/5.7.2), why can't I deploy to mainnet

Question

require("@nomiclabs/hardhat-ethers");
require ("dotenv").config();

/** @type import('hardhat/config').HardhatUserConfig */
module.exports = {
  solidity: "0.8.10",
  networks:{
    mainnet: {
      url: `https://eth-mainnet.g.alchemy.com/v2/APIKEY`,
      accounts: [process.env.PRIVATE_KEY],
    }
  }
};

i want to know what is really wrong cos infura rpc url also return this error

Answer 1

Please verify that you have this in your package.json:

{
  ...,
  "scripts": {
    ...,
    "deploy": "npx hardhat run scripts/deploy.js --network mainnet"
  }
}

Or use directly the command npx hardhat run scripts/deploy.js --network mainnet.

For more info, see: https://hardhat.org/tutorial/deploying-to-a-live-network