Security · Duo: API, dashboard, SDK, documentation
Vouch
Stops free-trial abuse
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.
the 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.
→ the 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.
what shipped
- 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
Screens
