What is an API gateway with abuse detection?

It's a FastAPI proxy that layers Bloom filters, sliding-window rate limits, credential stuffing counters, and bot entropy checks to protect upstream services.

How does sliding window rate limiting work in Redis?

Timestamps in ZSETs, atomic Lua purge-and-count — no races, exact enforcement per client_id.

Does behavioral detection catch slow scrapers?

Absolutely — low inter-request deviation flags regularity, regardless of volume.

🗄️ Databases & Backend

I Built an API Gateway That Catches Bots Rate Limits Miss — And Nearly Broke It Debugging

Picture this: 150 requests hammering your API at once. Half get blocked perfectly, proving rate limits actually work. But what if bots play nice? Enter behavioral abuse detection.

theAIcatchup Apr 10, 2026 4 min read

Diagram of API gateway middleware chain blocking abusive requests

⚡ Key Takeaways

Sliding window + Lua atomics make rate limiting bulletproof against bursts. 𝕏
Behavioral detection via entropy catches stealthy, low-volume bots. 𝕏
Build your own gateway: lean, explainable, interview rocket fuel. 𝕏

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theAIcatchup

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#API Gateway #Abuse Detection #FastAPI #FastAPI Security #Redis #rate limiting

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Originally reported by dev.to

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