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When you select Arbitrum in the trading interface, your wallet will prompt you to add the network if it is not already configured.

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What is Arbitrum One/Nitro/Nova? How does it differ from Ethereum?

Arbitrum One and Arbitrum Nova are networks developed by Offchain Labs. Both run on Nitro. Gains is deployed on Arbitrum One. For more detail, see Offchain Labs’ articles on Nitro and Arbitrum Nova.

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Arbitrum MetaMask Setup

To add Arbitrum automatically to MetaMask, go to Arbiscan, scroll to the bottom, and click Add Network. Scroll to the bottom to see the button to add Arbitrum. See below for more information on RPC endpoints. After setup, you can switch between Ethereum and Arbitrum in MetaMask.

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Getting Funds to Arbitrum

Arbitrum uses ETH as the native currency to pay for transactions, including to manage trades on Gains. If you don’t have any assets on Arbitrum, there are a number of ways to move them there.
  1. The official bridge is Arbitrum bridge. This takes about 10 minutes.
  2. For bridging GNS the bridge can be found on the bridging page.
  3. You can use a third-party bridge to bridge from other chains. Use caution with any bridge. Confirm links from the service’s official website or communication channels before connecting your wallet.
  4. Some centralized exchanges support withdrawing ETH to Arbitrum.
    Ensure you have selected Arbitrum One as the chain to withdraw to and not Ethereum.

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RPC Endpoints

RPCs are what MetaMask uses to connect to the blockchain, fetch information, and send transactions. Public RPCs are the easiest way to access Arbitrum. During high usage, gas costs can rise and public RPCs can become congested. If you trade with large collateral amounts, using your own endpoint can improve reliability.
The trading interface does not rely on your MetaMask RPC to display trades. It uses dedicated RPC infrastructure and streams data to the frontend. Your MetaMask RPC is mainly used to send transactions.
If you use public RPCs, keep more than one available in MetaMask so you can switch quickly if one becomes slow. Public RPCs: You can get your own Arbitrum endpoint from infrastructure providers such as: