Rate Limiting Python Packages

limits

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

ratelimit

API Rate Limit Decorator

aiolimiter

An efficient implementation of a rate limiter for asyncio.

flask-limiter

Rate Limiting extension for Flask

pyrate-limiter

⚔️Python Rate-Limiter using Leaky-Bucket Algorithm Family

requests-ratelimiter

Easy rate-limiting for python requests

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.

celery-singleton

Seamlessly prevent duplicate executions of celery tasks

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.

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).

upstash-ratelimit

Rate limiting library for serverless runtimes in Python

mthrottle

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

python-redis-rate-limit

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

limiter

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

polite-http

A courteous, dependency-free HTTP client with rate limiting, retries, and backoff.

baldur-framework

Self-healing reliability layer for Python — circuit breaker, retry, and fallback behind a single decorator. Framework-agnostic core with Django, FastAPI, Flask, and Celery adapters.

spn-client

A hardened Python client for archive.org's availability API and Save Page Now (SPN2): process-wide rate pacing with a circuit breaker, dual-mode anonymous/S3-authenticated submission, and an explicit archive-outcome vocabulary.

httpx-ratelimiter

Leaky-bucket ratelimiting for httpx

nullrun

Enforcement gateway for AI agents. Nullrun official Python SDK.

asyncio-redis-rate-limit

Rate limiter for async functions using Redis as a backend.

flask-captchaify

A strong bot protection system for Flask with many features: rate limiting, special rules for users, web crawler detection, and automatic bot detection.

proactive-gate

Decide whether a proactive AI agent may reach a user right now, and log why not. Ordered checks as code or JSON, presets for platform and legal limits, adapters for agent frameworks, a browser playground, and a Python sibling held to the same fixtures.