# API Reference

::::card-grid
:::card{title="Introduction" href="/guides/api-reference-introduction"}
Understand general concepts, response codes, and authentication strategies.
:::

:::card{title="Pagination" href="/guides/api-reference-pagination"}
Learn how pagination works in the Resend API.
:::

:::card{title="Usage Limits" href="/guides/api-reference-rate-limit"}
Learn about API rate limits, email sending quotas, and contact quotas.
:::

:::card{title="Errors" href="/guides/api-reference-errors"}
Troubleshoot problems with this comprehensive breakdown of all error codes.
:::
::::

## Related pages

- [Account Management](./account-management-index.md)
- [API Keys](./api-keys-2-index.md)
- [API Keys](./api-keys-index.md)
- [AudiencesDEPRECATED](./audiencesdeprecated-index.md)
- [Authorized Apps](./authorized-apps-index.md)
- [Automations](./automations-index.md)
- [Broadcasts](./broadcasts-index.md)
- [Build with AI](./build-with-ai-index.md)
- [Changelog](../changelog.md)
- [Contact Imports](./contact-imports-index.md)

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