# KaiGPT Claude Messages API

**Canonical:** https://apis.io/apis/gptzzz/kaigpt-claude-messages-api/  
**Provider:** KaiGPT — https://apis.io/providers/gptzzz/  
**Documentation:** https://gptzzz.ai/blog/claude-api-quickstart/

KaiGPT Claude Messages API is one of 2 APIs that [KaiGPT](https://apis.io/providers/gptzzz/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Claude, Message, and LLM Gateway. The published artifact set on APIs.io includes API documentation.

Claude Messages relay route. The docs give https://gptzzz.ai/v1/messages for Claude Messages requests and say Claude clients must use that protocol configuration rather than the OpenAI request body; the gateway accepts the key in the x-api-key header.

## Machine-readable artifacts (3)

- **Documentation** — https://gptzzz.ai/docs/
- **Documentation** — https://gptzzz.ai/blog/claude-api-quickstart/
- **Documentation** — https://gptzzz.ai/blog/claude-code-api-relay/

## Other KaiGPT APIs (1)

- [KaiGPT OpenAI-Compatible API](https://apis.io/apis/gptzzz/kaigpt-openai-compatible-api/)

## Tags

Claude, Message, LLM Gateway

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