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

# API V3 overview

<Warning>API V3 is no longer in active development. V4 is now available via an open beta, with documentation for this found [here](/api-reference/overview)</Warning>

This documentation provides details for interfacing with Kit's API V3. All API calls are relative to the base URL: `https://api.convertkit.com/v3/`.

For technical support with this legacy API, please contact [Kit's support team](https://kit.com/support).


## Related topics

- [Kit App Store overview](/kit-app-store/overview.md)
- [Plugin overview](/plugins/overview.md)
- [Overview](/plugins/component-library/overview.md)
- [MCP overview](/mcp/overview.md)
- [Content blocks overview](/plugins/content-blocks/overview.md)