# Kit API V3 (Deprecated)

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

Kit API V3 (Deprecated) is one of 16 APIs that [Kit](https://apis.io/providers/convertkit/) 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 (2)

- **Documentation** — https://developers.kit.com/v3/api-reference
- **Deprecation** — https://developers.kit.com/v4/api-reference/v3-to-v4-upgrade-guide

## Other Kit APIs (12)

- [Kit Accounts API](https://apis.io/apis/convertkit/convertkit-accounts-api/)
- [Kit Broadcasts API](https://apis.io/apis/convertkit/convertkit-broadcasts-api/)
- [Kit Custom Fields API](https://apis.io/apis/convertkit/convertkit-custom-fields-api/)
- [Kit Email Templates API](https://apis.io/apis/convertkit/convertkit-email-templates-api/)
- [Kit Forms API](https://apis.io/apis/convertkit/convertkit-forms-api/)
- [Kit Posts API](https://apis.io/apis/convertkit/convertkit-posts-api/)
- [Kit Purchases API](https://apis.io/apis/convertkit/convertkit-purchases-api/)
- [Kit Segments API](https://apis.io/apis/convertkit/convertkit-segments-api/)
- [Kit Sequence Emails API](https://apis.io/apis/convertkit/convertkit-sequence-emails-api/)
- [Kit Sequences API](https://apis.io/apis/convertkit/convertkit-sequences-api/)
- [Kit Snippets API](https://apis.io/apis/convertkit/convertkit-snippets-api/)
- [Kit Subscribers API](https://apis.io/apis/convertkit/convertkit-subscribers-api/)

## Tags

Email Marketing, Subscribers, Deprecated

---

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