# idem0

> Exactly-once for your LLM API calls. Retry safely, replay any call, never double-pay.

## Docs

- [API reference](https://docs.idem0.dev/api-reference.md): The SDK surface and the HTTP contract.
- [Concepts](https://docs.idem0.dev/concepts.md): Idempotency keys and replay, in two minutes.
- [idem0](https://docs.idem0.dev/index.md): Exactly-once for your LLM API calls. Retry safely, replay any call, never double-pay.
- [Quickstart](https://docs.idem0.dev/quickstart.md): Make your first idempotent call, then watch the same call replay for free.