Metamask: Add Arbitrum Testnet Network

To configure Metamask for the Arbitrum Test Network we must add a new RPC Network. For this, open Metamask, access the accounts menu at the top-right corner and select Settings:

Scroll down to the Networks section and select it:

At the bottom click on Add Network and fill in the following data:

• Network Name: Arbitrum Rinkeby

• New RPC URL: https://rinkeby.arbitrum.io/rpc
• Chain ID: 421611

• Currency Symbol: ETH

• Block Explorer URL: https://testnet.bscscan.com

Finally select the Arbitrum Rinkeby in Metamask's network selector (drop down at the top of Metamask):

You are connected to the Arbitrum Rinkeby now.