Obtain chainId#

For Ethereum chain development, it's important to keep track of a user's network chain ID, as all RPC requests are submitted to the currently connected network.

Use the eth_chainId RPC method to detect the chain ID of a user's current network. Listen to the chainChanged provider event to detect when the user changes networks.

As an example, the following code is used to detect a user's network and when the user changes networks:

const chainId = await window.ethereum.request({ method: 'eth_chainId' });

window.ethereum.on('chainChanged', handleChainChanged);

function handleChainChanged(chainId) {
  // We recommend reloading the page, unless you must do otherwise.
  window.location.reload();
}

Chain IDs#

These are the IDs of the Ethereum chains that OKX Wallet supports by default.

Consult chainid.network for more.