You want to build against Fulcra directly: read your data, write to it, or wire it into something of your own.
It's an authenticated REST API, and the developer documentation is the canonical source. It stays current with the platform, which this article won't.
To get started quickly, such as from a notebook, use the fulcra-api Python client library; we have a detailed guide and API reference for this here: https://fulcradynamics.github.io/fulcra-api-python/
Full details are in the developer documentation:
For example notebooks, runnable via Colab, see our demos repository: https://github.com/fulcradynamics/demos