The complete API reference for each library is generated from its own source on every commit, so it never drifts from the code. The guides here explain how to use them; these list every symbol.
Looking for the HTTP API you can call from a server or another site? That is the REST API, not this page.
trendflow — TypeDoc, from types.
trendflow-py — mkdocstrings, from docstrings.
If you are looking for how to do something, start with the guides. If you already know the method and want its exact signature, parameters, or return type, use the reference above. For the differences between the two libraries, see parity.