Sentinel

What it does

Sentinel is a developer-first security monitoring platform for SaaS and APIs. It detects bots, fraud, and abnormal behavior in real time, giving actionable alerts before damage happens. Lightweight, easy to integrate, and affordable — unlike bloated enterprise SIEMs, Sentinel keeps your apps safe without the complexity.

Stop 92% of bot signups without CAPTCHAs. Sentinel is the CAPTCHA alternative for APIs: sub-50ms trust decisions using infrastructure forensic signals.

Sentinel establishes absolute trust at the edge. We bypass legacy CAPTCHA friction and probabilistic guessing, replacing them with cryptographic intent verification and structural telemetry. Sentinel was engineered by infrastructure security veterans who were tired of watching CAPTCHAs fail, WAFs misfire, and rate limiters punish legitimate users. We took a different approach: deterministic trust from structural data alone. Every connection to your API is a packet of raw infrastructure intelligence — ASN topology, behavioral entropy, carrier-level provenance. We parse it all in under 50ms and return a single, mathematically-grounded verdict. const result = await sentinel.check(req.ip, {…from sentinel.risksignal.name.ng

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