Rate Limiter Python Packages

slowapi

A rate limiter for Starlette and FastAPI

pyrate-limiter

⚔️Python Rate-Limiter using Leaky-Bucket Algorithm Family

throttler

🔀⏳ Easy throttling with asyncio support

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).

pyresilience

Unified resilience patterns for Python — retry, circuit breaker, timeout, fallback, bulkhead, rate limiter, and cache in one decorator. Python's Resilience4j.

mthrottle

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

arcjet

Runtime security for AI apps and agents: prompt injection detection, tool-call authorization, sensitive-data redaction, bot protection, and rate limiting. Drop it into your Python code.

arcjet-sensitive-info-rampart

Runtime security for AI apps and agents: prompt injection detection, tool-call authorization, sensitive-data redaction, bot protection, and rate limiting. Drop it into your Python code.

asyncio-redis-rate-limit

Rate limiter for async functions using Redis as a backend.

reqstorm

Send thousands of HTTP requests from Python or the command line: per-host rate limits, retries with backoff, pagination, progress and logs, results straight to JSONL, CSV, SQLite, PostgreSQL or MySQL.

token-throttle

Multi-resource rate limiting for LLM APIs. Reserve tokens before you call, refund what you don't use, stay under the limit across workers.

aiohttp-ratelimiter

A rate limiter for the aiohttp.web framework

adaptive-rate-limiter

Provider-agnostic adaptive rate limiting for AI/ML APIs with intelligent scheduling, streaming support, and distributed backends

fastapi-cap

A robust, extensible, and production-ready rate limiting library for FastAPI, supporting multiple algorithms and Redis backend.

asyncmq

Supercharge your async applications with tasks so fast, you’ll think you’re bending time itself.

self-limiters

Async distributed rate limiters for Python

googleapis-without-429

Stay inside Google API quotas instead of recovering from 429 — one argument, the rest of your code unchanged.

aiorate

Loop frequency regulation for asyncio

reqt

Send thousands of HTTP requests from Python or the command line: per-host rate limits, retries with backoff, pagination, progress and logs, results straight to JSONL, CSV, SQLite, PostgreSQL or MySQL.

moderato

Async Redis-backed rate limiting for FastAPI & Starlette - fixed window, token bucket & sliding window algorithms with cost-weighted limits, multi-tenancy, and Prometheus metrics.

ratellmiter-ai

Rate limiter for LLM clients

llmratelimiter

Distributed rate limiter for LLM APIs with FIFO queues, TPM/RPM limits, and burst prevention

llm-token-guard

Track LLM token usage, enforce rate limit & budget policies, and trigger alerts across OpenAI, Groq, OpenRouter, and AWS Bedrock.