API Rate Limiting
Restricting the number of API requests a client can make in a given time window.
API rate limiting restricts the number of API requests a single client can make in a given time window, protecting backend services from abuse, runaway costs, and resource exhaustion. Common patterns: token bucket, leaky bucket, fixed window, sliding window. Rate limit headers (X-RateLimit-Limit, X-RateLimit-Remaining, Retry-After) communicate state to clients. Tools: Cloudflare Rate Limiting, Upstash Ratelimit, Stripe's published patterns. Particularly critical for AI applications where unbounded LLM calls can cause runaway costs. Empire325 implements rate limiting on every production API and AI agent we ship.
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