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Coinbase Wallet Programmatic Setup on Celo

warning

As of block height 31,056,500 (March 26, 2025, 3:00 AM UTC), Celo is no longer a standalone Layer 1 blockchain—it is now an Ethereum Layer 2! Some documentation may be outdated as updates are in progress. If you encounter issues, please file a bug report.

For the most up-to-date information, refer to our Celo L2 documentation.

Adding a Celo Network to Coinbase Wallet​

To add a Celo Network to your dApp, you can use Coinbase's RPC API's wallet_addEthereumChain method. (See documentation).

Here is a JavaScript snippet you can use:

await window.ethereum.request({
    method: 'wallet_addEthereumChain',
    params: [<INSERT_NETWORK_PARAMS_HERE>],
});

Where it says INSERT_NETWORK_PARAMS_HERE, please replace with any of the following constants, depending on which network you'd like to connect to.

Mainnet​

const CELO_PARAMS = {
  chainId: "0xa4ec",
  chainName: "Celo",
  nativeCurrency: { name: "Celo", symbol: "CELO", decimals: 18 },
  rpcUrls: ["https://forno.celo.org"],
  blockExplorerUrls: ["https://explorer.celo.org/"],
  iconUrls: ["future"],
};

Alfajores​

const ALFAJORES_PARAMS = {
  chainId: "0xaef3",
  chainName: "Alfajores Testnet",
  nativeCurrency: { name: "Alfajores Celo", symbol: "A-CELO", decimals: 18 },
  rpcUrls: ["https://alfajores-forno.celo-testnet.org"],
  blockExplorerUrls: ["https://celo-alfajores.blockscout.com/"],
  iconUrls: ["future"],
};

Adding Tokens (e.g. cUSD, cEUR)​

To watch an asset on a Celo netowork (e.g. cUSD, cEUR) in your dApp, you can use MetaMask's RPC API's wallet_watchAsset method. (See documentation).

Here is a JavaScript snippet you can use:

await window.ethereum.request({
  method: "wallet_watchAsset",
  params: {
    type: "ERC20",
    options: {
      address: "<INSERT_ADDRESS_HERE>",
      symbol: "<INSERT_SYMBOL_HERE>",
      decimals: 18,
    },
    iconUrls: ["future"],
  },
});
  • Where it says INSERT_ADDRESS_HERE, please replace with any of the following constants, depending on which network and which asset you'd like to connect to.
  • Where it says INSERT_SYMBOL_HERE, please replace with the correct symbol for the asset you'd like to watch. For Celo Dollars, it's cUSD and for Celo Euros, it's cEUR.
tip

View available token addresses for Celo assets to add to Coinbase Wallet here.