The isEthereum utility is designed to verify if the chain id is a valid Ethereum Mainnet or Ethereum Sepolia chain id.

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Usage

import { isEthereum } from '@coinbase/onchainkit';

// Ethereum Mainnet (chain ID: 1)
isEthereum({ chainId: 1 }); // returns true

// Ethereum Sepolia (chain ID: 11155111)
isEthereum({ chainId: 11155111 }); // returns true

// Base (chain ID: 8453)
isEthereum({ chainId: 8453 }); // returns false

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Returns

boolean - Returns true if the chain id is Ethereum Mainnet or Ethereum Sepolia, otherwise false.

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Parameters