Rate Limiting Python Packages

limits

Rate limiting using various strategies and storage backends such as redis, memcached & mongodb

flask-limiter

Rate Limiting extension for Flask

aiolimiter

An efficient implementation of a rate limiter for asyncio.

ratelimit

API Rate Limit Decorator

pyrate-limiter

⚔️Python Rate-Limiter using Leaky-Bucket Algorithm Family

rush

Modular, way of implementing rate-limiting in python with a few handy default implementations

throttled-py

🔧 High-performance Python rate limiting library with multiple algorithms (Fixed Window, Sliding Window, Token Bucket, Leaky Bucket & GCRA) and storage backends (Redis, In-Memory).

requests-ratelimiter

Easy rate-limiting for python requests

celery-singleton

Seamlessly prevent duplicate executions of celery tasks

loop-rate-limiters

Loop rate limiters in Python with an API similar to rospy.Rate

piccolo-api

ASGI middleware for authentication, rate limiting, and building REST endpoints.

pydantic-ai-middleware

Guardrail capabilities for Pydantic AI — cost tracking, prompt injection detection, PII filtering, secret redaction, tool permissions, and async guardrails. Built on pydantic-ai's native capabilities API.

pydantic-ai-shields

Guardrail capabilities for Pydantic AI — cost tracking, prompt injection detection, PII filtering, secret redaction, tool permissions, and async guardrails. Built on pydantic-ai's native capabilities API.

python-redis-rate-limit

Python Rate Limiter implemented based on Redis INCR, EXPIRE, EVALSHA and EVAL.

upstash-ratelimit

Rate limiting library for serverless runtimes in Python

limiter

⏲️ Easy rate limiting for Python using a token bucket algorithm, with async and thread-safe decorators and context managers

mthrottle

A simple and generic rate limiter to prevent too many function calls or http requests.

aiohttp-ratelimiter

A rate limiter for the aiohttp.web framework

plimit

Run multiple async functions with limited concurrency — Python port of p-limit

flask-captchaify

Protect against bots and DDoS attacks

httpx-ratelimiter

Leaky-bucket ratelimiting for httpx

veronica-core

Runtime containment kernel for LLM agents. Enforces budget, step, retry, and circuit-breaker limits before the model call.

asyncio-redis-rate-limit

Rate limiter for async functions using Redis as a backend.

aiorate

Loop frequency regulation for asyncio