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IPQualityScore (IPQS)
Per-query IP / email / device / URL fraud scoring API — generous free tier, paid from $0.0008/query.
Free tier: 5,000 free queries/mo on most endpoints
What it does well
- Generous free tier offers 5,000 queries per month across most APIs.
- Combines multiple fraud detection vectors (IP, email, device) into one service.
- Simple, pay-as-you-go pricing model scales from zero with low per-query costs.
Where it falls short
- Primarily an API-based tool; lacks a comprehensive GUI for non-technical users.
- Free tier support is limited to email and documentation, no live agents.
- Accuracy can vary for niche or newly emerging threat types, like any scoring system.
Alternatives to IPQualityScore (IPQS)
Fingerprint (FingerprintJS)
freemiumBrowser fingerprinting library + paid Pro API — free OSS core, paid plans from $99/mo.
Seon
freemiumAPI-first fraud screening with social-media + email enrichment — published from $599/mo.
MaxMind minFraud
paidPer-query fraud-risk scoring API — from $0.005/lookup, MaxMind's flagship paid product alongside GeoIP.
GuardLabs Anti-Fraud
paidReferral / signup antifraud pipeline — Turnstile + 9 automated checks + 14-day hold + admin queue. From $99 one-time.