rate-limiting

Tiered API rate limiting is implemented by enforcing per-user and per-subscription quotas using a sliding window algorithm. This approach allows you to define distinct limits for free, pro, and enterprise tiers to ensure fair usage across tenants.

A sliding window rate limit algorithm tracks requests continuously over a rolling time period rather than resetting at fixed intervals. Use it for SaaS APIs to provide smoother traffic distribution and prevent burst abuse at window boundaries.

Yes, you can use Redis for rate limiting middleware in FastAPI or Express. You initialize a RateLimiter with a Redis connection and mount the provided middleware directly into your HTTP service to enforce quotas.

To return rate limit headers like remaining and retry information, you mount the rate limiting middleware in your HTTP service. It automatically exposes headers containing remaining, reset, and retry details for the client.

Yes, the sliding window rate limiter supports burst allowances for different subscription levels. It features tier-based configuration for free, pro, and enterprise plans with specific per-minute quotas and burst limits.