ratelane-sdk
API observability and live policy control plane middleware for FastAPI.
Ratelane gives you fleet-wide visibility and real-time policy enforcement — rate limits, route enable/disable, per-route timeouts, and CORS — without redeploying your app. Policy changes push to all instances within 10 seconds.
Installation
```bash pip install ratelane-sdk ```
Quick start
```python from fastapi import FastAPI from ratelane import RatelaneConfig, RatelaneMiddleware
app = FastAPI()
app.add_middleware( RatelaneMiddleware, config=RatelaneConfig( api_key="your_api_key", collector_url="https://your-ratelane-backend.com", fastapi_app=app, ) ) ```
Features
- Rate limiting — global and per-route, enforced locally with no network call on the hot path
- Route control — enable/disable routes with custom status codes and messages
- Per-route timeouts — automatic 504 on slow downstream responses
- CORS — dynamic allowed origins pushed from the dashboard
- Emergency Profile — automatic fallback policy when the policy server is unreachable
- Fleet visibility — per-instance sync status, last seen, and policy signature in the dashboard
CLI
```bash
Clear state for this project
ratelane clear --collector-url https://... --api-key sk_live_...
Clear all Ratelane state on this machine
ratelane clear --all ```
License
Copyright 2026 Ratelane. All Rights Reserved.
1 maintainer
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