Fraud detection platform combining email validation with device fingerprinting. Disposable email detection, IP reputation scoring, and real-time risk scoring with ALLOW/FLAG/BLOCK recommendations.
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Problem
SaaS companies lose free-trial capacity to repeat signups. Email validation catches obvious disposable addresses, but misses the same user returning with a new address or domain.
Approach
- Layered email validation, device fingerprinting, and IP reputation instead of relying on disposable-domain checks alone.
- Built a real-time scoring API that returns ALLOW, FLAG, or BLOCK decisions that product teams can act on during signup.
- Shipped the API, SDK, dashboard, and documentation as a two-person team on Cloudflare-first infrastructure.
Outcome
Multi-signal fraud score across email, device, and IP data
Real-time ALLOW/FLAG/BLOCK recommendations
Dashboard and SDK shipped with the API
Edge-deployed architecture suitable for signup-critical paths
Tech
Cloudflare Workers Cloudflare KV D1 Supabase Stripe