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1. Add a Network

Add Arbitrum chain to your wallet （Skip this step if you've already done**）**

1. Open your MetaMask, from the setting section, click Networks

   

2. Click Add Network. From POPULAR page,choose Arbitrum One and click Add

1. Click Approve to add Arbitrum One to your MetaMask

1. If there doesn’t show on the pages, you need to add it manually, click CUSTOM NETWORKS

   Fill in the information corresponding to the Arbitrum One, then cick the Add

   

Arbitrum One:

• Network Name： Arbitrum One
• New RPC URL: https://arb1.arbitrum.io/rpc
• Chain ID:  42161