FastAPI is a modern Python web framework for building APIs with high-performance asyncio, Pydantic validation, and OpenAPI docs. Commercial support includes hosting, monitoring, and enterprise features.

FastAPI is open-source and fully usable in China. Commercial support (via Tiangolo) requires communicating with overseas servers, which may be slow, but core framework is unaffected.

The information regarding service availability in China is provided for general reference purposes only. Due to the dynamic nature of network conditions and regulatory environments, the actual accessibility of these services may vary over time and by location. Users are advised to verify the current status independently.