Optimism Custom RPC

Network NameOptimism
Network URLhttps://mainnet.optimism.io
Chain Id10
Currency SymbolETH
Block Explorerhttps://optimistic.etherscan.io
Optimism Custom RPC

If you are testing any website on Optimism then you must have to add the RPC in your MetaMask first to start

How To Add Optimism Custom RPC To MetaMask:

Go to Metamask and then click on the selected network and then click on the add network option