🔒 Your spec is never stored — scanned in memory, deleted immediately.  ·  Built by engineers with hands-on experience at Razorpay, Cashfree & Paytm PG
PAYMENT API SECURITY SCANNER

Find missing fraud edge cases before your customers do.

Upload your OpenAPI spec. In minutes, see exactly which fraud and failure scenarios your payment APIs aren't testing — before you ship to production.

Pre-production — zero risk to your live system
No engineering bandwidth needed
Results in under 60 seconds
20–40%
avg fraud gaps found
47
scenarios checked
60 sec
scan time
Payment API Risk Scanner
// Checks against 47 fraud & failure scenarios
Upload Your API Spec ✦ FREE SCAN
📄
Drop your OpenAPI / Swagger spec
Accepts .json · .yaml · .yml
📋
openapi.json
24 KB · Ready to scan
or paste a public spec URL
Work Email — get results sent here
🔒 Spec scanned in memory · Never stored · Results emailed instantly
34%
Risk Coverage Score Benchmark for your stage: 52%
14
GAPS FOUND
Preview — 3 of 14 gaps identified
CRITICAL
Idempotency Key Missing — POST /payments
Retry on network failure creates duplicate charge. No test coverage found.
CRITICAL
Velocity Check Bypass — /payments/initiate
High-frequency abuse scenario absent. No rate limit edge case tested.
HIGH
Auth-Capture Amount Mismatch
Capture > authorized amount not rejected. No test scenario defined.
+ 11 more gaps including 4 PCI / PSD2 compliance risks
Built by engineers with hands-on experience testing APIs at
Razorpay PG Cashfree PG Paytm PG Paytm Money Paytm Insurance
How it works

From API spec to risk report
in three steps.

No integration. No engineering setup. Just upload your OpenAPI spec and get a professional risk report in minutes.

1

Upload Your Spec

Drop in your OpenAPI or Swagger spec file. We support any REST API spec — single endpoint or full payment platform. No account needed for the free scan.

YAML · JSON · Postman Collection
2

We Run 47 Fraud Checks

Our backend checks your spec against a curated library of 47 payment fraud and failure scenarios — built from real-world exploit patterns, compliance mandates, and payment API incident data.

Runs in <60 seconds
3

Get Your Risk Report

Coverage score, full gap list by severity, compliance tags (PCI DSS, PSD2, RBI), and generated test code to fix each gap — ready to drop into your test suite.

PDF · Test Code · Fix Recommendations
See it in action

Watch a real payment API get scanned.

See exactly what the report looks like — a Razorpay-style payment API spec scanned in 45 seconds, revealing 11 gaps including 3 critical severity issues.

  • ✓
    Coverage score calculated live against 47 scenarios
  • ✓
    Each gap explained with endpoint, risk, and fix
  • ✓
    Compliance tags mapped (PCI DSS, PSD2, RBI)
  • ✓
    Test code generated to close every gap
DEMO VIDEO
> uploading openapi.yaml
> parsing 14 endpoints
> checking 47 scenarios...
> score: 34% coverage
> gaps found: 14 (4 critical)
Watch 2-min demo
Demo: Payment API spec → Full risk report in 45 seconds
What we check

47 fraud & failure scenarios your team may be missing.

🔴 47 scenarios · 8 categories · Updated monthly

We catalogued every known payment API exploit pattern — from velocity abuse to idempotency failures. Every scenario lives in our backend, updated as new fraud patterns emerge.

  • ✓ Idempotency & Retry Safety (5 checks)
  • ✓ Velocity & Rate Limiting (6 checks)
  • ✓ Authorization & IDOR (8 checks)
  • ✓ Amount & Currency Validation (7 checks)
  • ✓ 3DS & Authentication (5 checks)
  • ✓ Webhook Security (4 checks)
  • ✓ Data Privacy & PCI (7 checks)
  • ✓ Concurrency & Race Conditions (5 checks)
Critical
Idempotency Missing
Critical
Velocity Abuse
Critical
Auth-Capture Mismatch
Critical
Webhook Replay
High
IDOR on Payments
High
Negative Amount
High
3DS Bypass Path
High
Refund > Original
PCI Risk
PAN in Error Response
PCI Risk
Card Data in Logs
Critical
Race Condition
High
Currency Mismatch
Audit Pricing

Start free. Get the full picture.

The free scan shows you the problem. The paid audit gives you everything to fix it — report, compliance mapping, test code, and expert guidance.

Starter Audit
$299
For seed-stage & Series A fintechs. Fast, affordable, actionable.
  • ✓ Full risk report PDF
  • ✓ Coverage score + benchmark
  • ✓ All gaps with severity ratings
  • ✓ Async Loom walkthrough (15 min)
  • ✓ Generated test code for every gap
  • ✓ 48-hour delivery
MOST POPULAR
Pro Audit
$799
For Series B+ and scale-ups. Deep analysis + live expert session.
  • ✓ Everything in Starter
  • ✓ 60-min live review call
  • ✓ Compliance tagging (PCI/PSD2/RBI)
  • ✓ Executive summary (board-ready)
  • ✓ Recommendations roadmap doc
  • ✓ 5 business day delivery
Enterprise
Custom
For large fintechs and banks. Multi-API, team presentation, SLA.
  • ✓ Everything in Pro
  • ✓ Multi-API coverage
  • ✓ Team presentation deck
  • ✓ CI/CD integration guidance
  • ✓ Quarterly re-scan included
  • ✓ Dedicated SLA guarantee

After your audit — stay covered on every release

Upgrade to Vellix continuous monitoring. Automated scans on every PR, Slack alerts before deploys, and CI/CD integration. From $299/month. Learn more →

Why this matters

Pre-production beats post-production — always.

★★★★★

"We found an idempotency gap in our payment retry flow — exactly the kind of thing that causes double charges. Caught it before the release, fixed in one sprint."

Head of Engineering
Series B Payments Platform · India
★★★★★

"The audit report became our internal checklist for every release. The compliance tagging alone saved us weeks of manual PCI review."

CTO
NBFC · Lending API
★★★★★

"Finding a fraud gap in production costs 50x more than finding it before release. Vellix is the cheapest insurance you can buy for your payment API."

VP Engineering
Neobank · Series A

Your next release has gaps. Find them now — free.

Free scan takes 60 seconds. No signup, no engineering effort, no commitment. See your risk coverage score instantly.

✦ Run Free Scan Now View Audit Pricing