API keys for FastAPI, in a few lines.

from fastapi import Depends, FastAPI
from keygate import ApiKey, KeyGate

app = FastAPI()
gate = KeyGate(app, admin_secret="change-me")  # SQLite, zero setup

@app.get("/hello")
def hello(key: ApiKey = Depends(gate.require)):
    return {"hello": key.owner_id}

if not gate.list_keys():  # demo only: mint a first key
    print("Your API key:", gate.create_key("demo-tenant", per_minute=5).key)

$ uvicorn app:app
Your API key: kg_...
INFO:     Uvicorn running on http://127.0.0.1:8000

$ curl -i localhost:8000/hello
HTTP/1.1 401 Unauthorized # no key

$ KEY=kg_... # the key the app printed
$ curl -H "X-API-Key: $KEY" localhost:8000/hello
{"hello":"demo-tenant"}

$ for i in 1 2 3 4; do curl -s -o /dev/null -w "%{http_code}\n" -H "X-API-Key: $KEY" localhost:8000/hello; done
200
200
200
200 # 5 requests so far, the limit is 5 per minute

$ curl -i -H "X-API-Key: $KEY" localhost:8000/hello
HTTP/1.1 429 Too Many Requests
Retry-After: <seconds>

$ keygate usage 1 # see what was counted