Add Custom Network to MetaMask

Add any custom network to MetaMask with Endpoint HTTP link and chain ID

MetaMask browser extension

With https://metamask.io/ added to your browser, click the Networks drop down box then select 'Add Network'

MetaMask Add a network settings

This will bring up the Add a network settings in MetaMask. This example is for Arbitrum Mainnet with a custom HTTP link.

Network Name: Arbitrum One Custom

New RPC URL: Your Alchemy or Infura HTTP link from previous step

Chain ID: 42161

Currency Symbol: ETH

Block Explorer (Optional): https://arbiscan.io/

Click 'Save' and a custom Arbitrum One RPC endpoint has been added to MetaMask. Try it out with your favorite Arbitrum One dApp!