Email validation that handles 50K emails without breaking
Stop fighting timeouts and rate limits. Validate email lists in seconds, not hours.Cut validation costs by up to 73% with our shared cache.
Try it live
Test our API with any email address
Every day, developers waste hours on email validation
The Problem
Timeouts after 100 emails
Traditional APIs can't handle bulk validation
Rate limits killing your app
60 requests/minute means hours of waiting
$0.01/email adding up fast
Validating the same emails repeatedly
Building your own = 40 hours + maintenance
Complex MX checks, SMTP handshakes, disposable lists
The ValidKit Solution
Handle 50K emails in 5 seconds
Bulk API that never times out
No rate limits on paid plans
Validate as fast as you need
$0.10 per 1,000 emails
Shared cache means you pay less
3 lines of code to integrate
Simple API, SDKs for all major languages
Stop paying to validate emails everyone else already checked
When anyone validates an email, we cache the result. The next time anyone checks that email, it's instant and nearly free. Real results: 7ms (cached) vs 192ms (fresh validation).
First Validation
Fresh validation, result gets cached
Next 1,000 Validations
Instant results from shared cache
Your Savings
Community cache = lower costs for everyone
Why the Shared Cache Works
Privacy-first design
SHA256 hashing ensures email privacy
Tier-based access
Free: no access, Growth+: read, Pro+: contribute
Automatic for AI agents
Just add share_signals: true to your API calls
Earn API Credits
Contribute validations to earn rewards and discounts
Simple, powerful API
Validate email domains in milliseconds, not seconds
curl -X POST https://api.validkit.com/api/v1/verify \
-H "Content-Type: application/json" \
-H "X-API-Key: vk_beta_test_key_123456789" \
-d '{"email": "[email protected]"}'Note: This example uses a public test key.Get your own API key for production use.
{
"success": true,
"email": "[email protected]",
"result": {
"valid": true,
"format": {"valid": true},
"disposable": {"valid": true},
"mx": {"valid": true}
}
}{
"success": false,
"error": {
"code": "INVALID_EMAIL",
"message": "Invalid email format"
}
}Rate Limits
- • Free tier: 180 requests/minute
- • Pro tier: 10,000 requests/minute
- • Headers: X-RateLimit-Remaining
Response Headers
- • X-RateLimit-Limit: 180
- • X-RateLimit-Remaining: 179
- • X-RateLimit-Reset: 1640995200
Ready to validate emails 96% faster?
Join developers who are already saving thousands on email validation costs. Get 10,000 free validations every month.
Domain Validation vs Full Email Verification
Use ValidKit When:
- ✓Validating sign-up forms in real-time
- ✓Pre-screening data before expensive operations
- ✓AI agents processing thousands of emails
- ✓Mobile apps needing instant validation
- ✓Catching typos and fake domains quickly
- ✓High-volume workflows on a budget
Instantly catches:
- ✓ Typos ([email protected])
- ✓ Fake domains ([email protected])
- ✓ Missing MX records
- ✓ Disposable emails
Use SMTP Verification When:
- •Running cold email campaigns
- •Cleaning purchased email lists
- •Sending critical transactional emails
- •Need to verify specific mailboxes exist
- •Willing to wait 5-30 seconds per email
- •Budget allows $0.005-0.01 per email
Services: ZeroBounce, NeverBounce, etc.
Real Cost Comparison
AI Agents Love ValidKit
ValidKit speaks the language of AI. Native support for autonomous agents, chatbots, and automation workflows. Your AI can verify emails as easily as your developers.
Works with any AI that can make API calls:
RESTful API with webhooks, OpenAPI spec available for easy integration
Bulk Verification
POST /api/v1/verify/bulk
{
"emails": [
"[email protected]",
"[email protected]"
]
}Process up to 1,000 emails per request (50,000 on Pro)
Programmatic API Keys
POST /api/v1/keys/generate
{
"email": "[email protected]",
"name": "Production Bot"
}Generate keys via API for your agents
Why developers choose ValidKit
Lightning Fast
Verify emails in milliseconds with our optimized API
Comprehensive Checks
Syntax, DNS, MX records, and disposable email detection
Secure & Private
Enterprise-grade security with data privacy built-in
AI-Ready
RESTful API designed for AI agents and automation workflows
Trusted by the Open Source Community
The technology behind ValidKit was created by the same developer who built the popular open-source node-email-verifier library, trusted by thousands of companies and downloaded over 53,000 times a week on npm. We built ValidKit to bring that same reliability to the agent economy at 100x the scale.
Simple, Transparent Pricing
Start free, upgrade as you grow. Get up to 96% faster validations on cache hits with Signal Pool™.
Free
- ✓ 10,000 validations/month
- ✓ 180 requests/minute
- ✓ API access
- ✓ Community support
- ❌ No Signal Pool™ access
Also available: Growth ($29/mo) and Starter ($49/mo) tiers with Agent Signal Pool™ read-only access
View all 6 pricing tiers →Calculate Your Savings
See how much money and time you can save by switching to ValidKit's domain validation infrastructure
ROI Calculator
See how much you can save with ValidKit