#Rate Limiting

API Rate Limits Decoded: OpenAI's Five-Tier System vs Everyone Else

A comprehensive systems guide to navigating OpenAI API Tier 1 to Tier 5 rate limits. We explore TPM/RPM token bucket throttling, dynamic concurrency pooling, enterprise commitments, and handling HTTP 429 retries.

API Rate Limits Explained: Token Bucket, Leaky Bucket, and Fixed Window (2026)

Building a Rate-Limited API Gateway on Cloudflare Workers

The Edge API Gateway architecture guide. How to build a sub-10ms rate-limited API gateway using Cloudflare Workers KV, Sliding Window Counter algorithms, and JWT auth.

Building Internal Cost Controls for AI Tool Usage Across a Team

The engineering team cost control playbook. How to build internal API proxy gateways, budget rate limiters, token usage dashboards, and model routing rules.

Multi-Tenant Rate Limiting: Fair Usage Without Starving Anyone

The SaaS API fairness blueprint. Token bucket vs sliding window per-tenant isolation, Redis Lua scripts for atomic decrement, and burst headroom allocation.

FastAPI Rate Limiting and Cost Controls for LLM-Backed Endpoints

Traffic-shaped rate limiting isn't enough when every request has a dollar cost attached. A layered approach: request limits, token-aware budgets, and hard circuit breakers.