SignupDoggy — Disposable Email, VPN & Tor Detection API · $0.01/call

Serverless fraud-detection API for SaaS signups. Catches disposable emails, VPN/Tor exit nodes, and bot patterns in one POST. $0.01 per request, no monthly fee, no sales call. Built for indie hackers.

SignupDoggy is a pay-per-call fraud-detection API for SaaS signups.

CATCH FAKE SIGNUPS BEFORE THEY SHIP
Disposable emails. VPN exits. Tor nodes. One POST to /v1/check returns a 0-1 risk score. $0.01 a call. Never expires.

What we check on every call:
- 125,847 disposable email domains
- 70,821 Tor exit nodes
- 24,000+ VPN / hosting ASNs
- Role-based email patterns
- Per-account custom blacklists
- Aggregated risk score in under 50ms

Pricing: $5 Solo (1,000 requests), $25 Pro (5,000 requests), $100 Scale (25,000 requests). Pay once, no expiry, no subscription, no sales call.

Compared to IPQualityScore ($0.05-$0.25 per call, $25/mo minimum) and SignupGate ($0.05-$0.30, $29/mo, annual contract), SignupDoggy is 5-30x cheaper per request and zero monthly minimum.

API endpoint: POST https://signupdoggy-api.jeffrinjames99.workers.dev/v1/check
Headers: x-api-key: $SIGNUPDOGGY_KEY
Body: {"email": "user@example.com", "ip": "1.2.3.4"}

Response includes per-signal risk scores, an overall risk band (low/medium/high), and a recommendation (allow/review/block). One credit per call.

Built by Jeffrin James, solo founder in Mumbai, India.