# LangWatch

> LLM ops platform for observability, evaluation and optimization of AI agents
> and pipelines. The REST API is described by an OpenAPI 3 document.

## Authentication

Send your API key as a bearer token:

    Authorization: Bearer sk-lw-...
    X-Project-Id: <project id>

Organization-level operations take an organization key as the bearer token and
need no project header. The `X-Auth-Token` header is also accepted and is
legacy; new integrations should use `Authorization`.

## API

- [OpenAPI document](/.well-known/openapi): the complete machine-readable
  description of the REST API. Also served at `/api/openapi.json`.
- [RPC catalogue](/api/rpc.discover): POST for the RPC-named operations and
  their argument schemas, without reading the whole document.

## Docs

- [REST API guide](https://docs.langwatch.ai/integration/rest-api): how to get
  an API key and make a first call.
- [Introduction](https://docs.langwatch.ai/introduction): what LangWatch does.