What is Vouch?
Vouch is a comprehensive email validation and fraud detection platform that helps you protect your application from fake accounts, disposable emails, and fraudulent signups. With 9 sophisticated validation checks and device fingerprinting technology, Vouch ensures only legitimate users access your platform.9 Validation Types
From syntax validation to SMTP verification, catch every type of invalid or risky email
Device Fingerprinting
Track devices across multiple signups to detect fraud patterns
IP Reputation
Identify VPNs, Tor networks, and known fraudulent IP addresses
Real-time Validation
Sub-second response times with smart parallel validation
Why Vouch?
Comprehensive Protection
Vouch doesn’t just check email syntax. We perform 9 different validation checks including:- Syntax validation - Ensure proper email format
- Disposable email detection - Block temporary email services
- MX record verification - Confirm domain has mail servers
- SMTP validation - Verify the mailbox actually exists
- Catch-all detection - Identify domains that accept all emails
- Role email detection - Flag admin@, support@, etc.
- Alias detection - Detect plus-addressing ([email protected])
- Device fingerprinting - Track device reuse across emails
- IP reputation - Detect VPNs, proxies, and fraud
Edge-Powered Performance
Built on Cloudflare Workers, Vouch delivers validation results in milliseconds from data centers worldwide. Our smart parallel validation architecture exits early on blocking checks while gathering comprehensive signals.Developer-Friendly
Get started in minutes with our SDKs for every platform:JavaScript
Browser applications
React
React with hooks
Node.js
Server-side validation
Next.js
Next.js integration
iOS
Swift SDK
Android
Kotlin SDK
Key Features
Smart Validation Strategy
Vouch uses an intelligent “early exit” strategy:- BLOCK checks use
Promise.race()- returns on first failure - FLAG checks run to completion for maximum insight
- Minimizes latency while maximizing data quality
Flexible Configuration
Configure validation behavior per project:- Enable/disable individual validation checks
- Set custom risk thresholds
- Whitelist/blacklist domains
- Customize recommendations
Rich Analytics
Track validation metrics over time:- Device type distribution
- Geographic patterns
- Threat signal statistics
- Usage trends
Enterprise-Ready
- Rate limiting - 1,000/hr (client) or 5,000/hr (server)
- Quota management - Subscription-based limits with grace periods
- Webhook notifications - Real-time updates on validation events
- Team management - Invite team members with role-based access
How It Works
1
Send email to /validate
Include email address and optional device signals
2
Parallel validation
9 validation checks run simultaneously with early-exit optimization
3
Risk scoring
Aggregate signals into actionable recommendation
4
Get results
Receive detailed validation results with recommendation: allow, flag, or block
Get Started
Quickstart
Get up and running in 5 minutes
API Reference
Explore the complete API
Choose Your SDK
Browse SDKs for your platform
Dashboard
Manage your projects
Pricing
Start free with 1,000 validations per month. Upgrade as you grow with transparent, usage-based pricing.View Pricing
See all plans and features