What problem does it solve?
Unprotected SaaS APIs are vulnerable to brute-force credential attacks, distributed denial-of-service (DoS) incidents, noisy-neighbor resource starvation on multi-tenant platforms, and abusive bot traffic, leading to service outages, data breaches, and unfair resource consumption for legitimate users.
Core Features & Use Cases
- Hierarchical rate limiting: Enforce layered limits at global, per-tenant, per-user, and per-IP scopes to prevent noisy neighbors and NAT abuse, with fail-closed behavior for sensitive authentication endpoints.
- IETF-compliant response semantics: Emit standard RateLimit headers and proper 429 Too Many Requests responses with Retry-After values to enable well-behaved clients to self-throttle without hitting limits.
- Algorithm and tooling guidance: Select the right rate-limiting algorithm (sliding window, token bucket, etc.) for your use case, with implementation examples for FastAPI, Spring Boot, .NET, Next.js, and common tools like Upstash Ratelimit, slowapi, and Bucket4j.
- Use case example: A multi-tenant B2B SaaS platform can use this skill to implement per-tenant caps that prevent one customer's runaway batch job from consuming all shared API capacity, while also blocking credential-stuffing attacks against login endpoints.
Quick Start
Use the rate-limiting skill to implement hierarchical per-tenant and per-IP rate limits for your SaaS API with proper IETF headers and brute-force protection for authentication endpoints.