fastmcp
The fast, Pythonic way to build MCP servers and clients
The Lens
FastMCP is the easiest way to build MCP servers in Python. Decorate a function, and it becomes a tool your AI assistant can call. Schema generation, validation, auth, transport: all handled.
Setup is one pip install and a few lines of code. If you've written a Flask route, you can write an MCP server. Prefect maintains this actively and it's now the foundation of the official MCP Python SDK.
Free, Apache 2.0. No underlying service costs unless you opt into Prefect's hosted platform. The standard choice for Python MCP development.
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Free vs Self-Hosted vs Paid
fully free## Free Tier The MCP server itself is completely free and open source. Install it, configure your MCP client, and use it without any cost.
## Self-Hosted Runs locally or on your own infrastructure. No external dependencies beyond the service it connects to.
## Paid No paid tier. The MCP server is free. The underlying service may have its own pricing.
Free and open source. The underlying service may have its own costs.
About
- Owner
- PrefectHQ (Organization)
- Stars
- 24,614
- Forks
- 1,931
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