> For the complete documentation index, see [llms.txt](https://titan-exchange.gitbook.io/titan/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://titan-exchange.gitbook.io/titan/developer-doc/special-order-types/reference.md).

# API Reference

The complete contract — auth, endpoints, schema, errors, and limits.

**The precise contract for every route, object, and error code, across all four order types.** Start with [Authentication](/titan/developer-doc/special-order-types/reference/authentication.md) for the header model, then [Endpoints](/titan/developer-doc/special-order-types/reference/endpoints.md) for the routes.