# Kit API V3 (Deprecated)

**Canonical:** https://apis.io/apis/kit/kit-api-v3/  
**Provider:** Kit — https://apis.io/providers/kit/  
**Base URL:** https://api.convertkit.com/v3  
**Documentation:** https://developers.kit.com/v3/api-reference

Kit API V3 (Deprecated) is one of 4 APIs that [Kit](https://apis.io/providers/kit/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Email Marketing, Subscribers, and Deprecated. The published artifact set on APIs.io includes API documentation.

The legacy ConvertKit V3 API is deprecated and slated for discontinuation; new integrations should target V4.

## Machine-readable artifacts (3)

- **Documentation** — https://developers.kit.com/v3/api-reference
- **Deprecation** — https://developers.kit.com/v4/api-reference/v3-to-v4-upgrade-guide
- **APIsJSON** — https://raw.githubusercontent.com/api-evangelist/kit/refs/heads/main/apis.yml

## Other Kit APIs (3)

- [Kit Account API](https://apis.io/apis/kit/kit-account-api/)
- [Kit Broadcasts API](https://apis.io/apis/kit/kit-broadcasts-api/)
- [Kit Subscribers API](https://apis.io/apis/kit/kit-subscribers-api/)

## Tags

Email Marketing, Subscribers, Deprecated

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/kit/kit-api-v3/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/kit/.