Mudassir Khan

Wallet setup walkthrough

Add Arbitrum One to MetaMask

One click and manual instructions for adding Arbitrum One (chain ID 42161) to MetaMask, Rabby, OKX Wallet, and any EIP 3085 compatible wallet. The same values work in Brave Wallet and Frame.

Add Arbitrum One to MetaMask

One click for injected wallets, or paste the JSON into the manual Add Network form.

{
  "chainIdHex": "0xa4b1",
  "chainName": "Arbitrum One",
  "nativeCurrency": {
    "name": "Ether",
    "symbol": "ETH",
    "decimals": 18
  },
  "rpcUrls": [
    "https://arb1.arbitrum.io/rpc"
  ],
  "blockExplorerUrls": [
    "https://arbiscan.io"
  ]
}
Manual steps (no injected wallet)
  1. Open MetaMask, click the network dropdown, then Add Network.
  2. Click "Add a network manually".
  3. Network name: Arbitrum One.
  4. New RPC URL: https://arb1.arbitrum.io/rpc.
  5. Chain ID: 42161.
  6. Currency symbol: ETH.
  7. Block explorer URL: https://arbiscan.io.
  8. Save and switch.

Verify what you are pasting

Before you save, double check the chain ID and the RPC URL. A wrong chain ID will let MetaMask sign transactions that no node will accept; a wrong or malicious RPC URL can show you fake balances. The values below match the Arbitrum One foundation docs as of 2026-05-15.

  • Chain ID: 42161 (hex 0xa4b1)
  • Native currency: ETH (18 decimals)
  • RPC URL: https://arb1.arbitrum.io/rpc
  • Block explorer: https://arbiscan.io

See the full reference page: Arbitrum One chain details.

Compatible wallets

The wallet add JSON above follows EIP 3085 (wallet_addEthereumChain). Any wallet that implements the standard will accept it. That includes MetaMask, Rabby, OKX Wallet, Brave Wallet, Frame, Trust Wallet, and most hardware wallet companion apps.

  • MetaMask

    Browser extension and mobile

  • Rabby

    Built around tx simulation and safety

  • OKX Wallet

    Multi chain with EVM + non EVM support

Safety notes

  • Only paste RPC URLs from sources you trust. A bad RPC can lie to your wallet about balances and gas.
  • Never paste your seed phrase into any "Add Network" flow. EIP 3085 does not need it.
  • If a dapp asks you to switch to a network it tried to add itself, verify the chain ID in MetaMask matches the official number above before approving.