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# Etherscan

Use the Etherscan API v2 to access data across over 50 [supported chains](https://docs.etherscan.io/etherscan-v2/getting-started/supported-chains), including Linea, with a single API key.

To get started, create an account on [Etherscan](https://etherscan.io/register), and then head to the [API key page](https://etherscan.io/myapikey) and generate a new key.

warning

Although you can use the same API key across multiple chains, you can only make requests to one chain at a time.

From here, you can use the API key in any request, defining the chains you want to use it with:

```javascript
async function main() {
  // query ETH balances on Ethereum Mainnet and Linea

  const chains = [1, 59144];

  for (const chain of chains) {
    const query = await fetch(`https://api.etherscan.io/v2/api
           ?chainid=${chain}
           &module=account
           &action=balance
           &address=INSERT_ADDRESS
           &tag=latest&apikey=INSERT_API_KEY`);

    const response = await query.json();

    const balance = response.result;
    console.log(balance);
  }
}

main();
```

For full details of how to use the Etherscan API v2, see the [documentation](https://docs.etherscan.io/etherscan-v2).