> ## Documentation Index
> Fetch the complete documentation index at: https://docs.etherscan.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Useful Links

> Quick links to the accounts, keys, and reference pages you use most on the Etherscan API.

Quick links to the pages and tools you will use most while building on the Etherscan API.

## Account and keys

* [Register](https://etherscan.io/register): create a free Etherscan account.
* [API dashboard](https://etherscan.io/myapikey): create and manage your API keys.
* [API plans and pricing](https://etherscan.io/apis): compare tiers and upgrade.

## Documentation

* [Set up your API key](/set-up-your-api-key): create an account and make your first request.
* [Make your first call](/make-your-first-call): make your first useful call and read the response.
* [API reference](/api-reference/endpoint/balance): every endpoint, grouped by resource.
* [Supported chains](/supported-chains): all chains and their `chainid` values.
* [Rate limits](/rate-limits): the calls-per-second and daily limits for each plan.
* [Common error messages](/common-error-messages): what each error means and how to fix it.
* [Changelog](/changelog): product updates and endpoint changes.

## Support

* [Contact us](/resources/contact-us): reach the team for help.
* [PRO endpoints](/endpoint-overview): what paid plans add.

## Explore

* [etherscan.io](https://etherscan.io): the block explorer.
* [Etherscan on X](https://x.com/etherscan): product updates and announcements.