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How To Add Arbitrum To Metamask

Guide to add Arbitrum Mainnet and Testnet as custom MetaMask RPC.
Arbitrum is an Optimistic Rollup and has made its name one of the top Layer 2 solutions on Ethereum. This section will include ways to add Arbitrum Mainnet and Testnet as your custom MetaMask RPC node.
  1. 1.
    Open Metamask and click the network name located at the top-right of the window
  2. 2.
    Click the Add Network button at the bottom of the pop-up window
  3. 3.
    Enter the following network details and click Save
    • Network Name: Arbitrum or Arbitrum One
      • You can name your Network Name anything to remind you which chain you’re connecting to.
    • New RPC URL: https://arb1.arbitrum.io/rpc
    • Chain ID: 42161
    • Currency Symbol: ETH or AETH
      • This is optional.
    • Block Explorer URL: https://arbiscan.io/
      • This is optional, but we recommend Arbiscan.
    After clicking Save, you will be directly switched to Arbitrum’s Network within the dropdown list.

Update Arbitrum Testnet (Goerli)

  1. 1.
    First, make sure you’ve enabled the Show test networks toggle.
    This will list all the default test networks within your network list. You can find this in Settings>Advanced>Show test Networks
    1. 2.
      Enter the following network details and click Save
      • Network Name: Arbitrum Testnet
      • New RPC URL: https://goerli-rollup.arbitrum.io/rpc/
      • Chain ID: 421613
      • Currency Symbol: AGOR
      • Block Explorer URL: https://goerli.arbiscan.io