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The isBase utility is designed to verify if the chain ID is a valid Base or Base Sepolia chain ID.

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Parameters

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chainId
number
required
The chain ID to verify. For example, 8453 for Base Mainnet or 84532 for Base Sepolia.

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Returns

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boolean
boolean
Returns true if the chain ID is Base or Base Sepolia, otherwise false.

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Usage

import { isBase } from '@coinbase/onchainkit';
const chainId = 8453;
if (isBase({ chainId })) {
console.log('The chainId is Base.');
} else {
console.log('The chainId is not Base.');
}