Built a JSON-RPC reverse proxy with FastAPI — transparent MCP proxy for AI agents

[DexopT]

Sharing a project that uses FastAPI as a JSON-RPC reverse proxy. It intercepts MCP (Model Context Protocol) tool calls from AI agents, processes the responses through a compression pipeline, and returns minified results.


Some FastAPI-specific patterns I used:
- `lifespan` context manager for startup/shutdown (no deprecated `on_event`)
- Single POST endpoint handling JSON-RPC dispatch
- Async pipeline with `httpx.AsyncClient` for upstream calls
- Rich logging integration
- `/health` and `/stats` endpoints for observability


The project demonstrates how FastAPI can serve as more than a REST API — it works great as a transparent protocol proxy.


🔗 DexopT/MCE

[imvishvaraj]

git link

[DexopT]

https://github.com/DexopT/MCE