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Over 500+ Enterprises Protected

Instantly detect and block temporary, disposable, and high-risk email addresses before they pollute your system with our high-performance infrastructure.

Start Validating for FreeRead the Docs
40 Million+
Domains Blocked
50ms
Avg Response Time
verify_user.js
const response = await fetch('https://api.fadsync.com/v1/verify', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer fs_live_********************',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({ email: '[email protected]' })
});

const data = await response.json();

if (data.is_disposable) {
  console.warn('⛔ Access Denied: Disposable domain detected.');
}
Why FadSync?

Fake users destroy your email reputation.

Disposable domains and malicious bot signups inflate your costs and tank your deliverability. FadSync provides the developer-first infrastructure to keep your user base authentic.

Bulletproof Protection

Stop disposable domains and high-risk actors before they ever reach your database. Our proprietary algorithms detect patterns that generic filters miss.

Learn more

Database Integrity

Ensure your CRM and user tables remain clean, reducing storage costs and improving deliverability. Automatically purge bad data without manual intervention.

Explore integration

Millisecond Latency

Our global edge network ensures validation happens in real-time without slowing down your signup flow. Optimized for sub-50ms response times worldwide.

View benchmarks
99.99%
Uptime SLA
40M+
Domains Blocked
<50ms
Global Latency
Developer First

Integrate in minutes.
Secure forever.

Our RESTful API drops into any stack effortlessly. With comprehensive SDKs and flawless documentation, you can start blocking malicious domains before your coffee gets cold.

Node.js
Python
<> Go
PHP PHP
Read the API Docs
FadSync Dashboard - bash
curl -X POST "https://api.fadsync.com/v1/verify" \
  -H "Authorization: Bearer $FADSYNC_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{ "domain": "malicious-pattern.io" }'
200 OK
124ms
{
  "status": "success",
  "data": {
    "domain": "malicious-pattern.io",
    "is_disposable": true,
    "risk_score": 0.98
  }
}
Transparent Pricing

Predictable pricing for any scale.

Start for free, upgrade when you need to. No hidden fees, no surprises.

Hobby

$0/month

Perfect for side projects and testing.

10,000 requests/month
Standard support
Community Discord
Most Popular

Pro

$29/month

For production apps scaling up.

100,000 requests/month
Sub-50ms latency edge network
Priority email support
Advanced analytics

Enterprise

Custom

For massive scale and custom SLAs.

Unlimited requests
99.99% Uptime SLA
Dedicated Slack channel
Custom onboarding

Need something custom?

We offer tailored infrastructure solutions for specific industry requirements including healthcare (HIPAA) and finance (PCI-DSS).

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SOC2 Certified

Enterprise-grade security standards.

Global Edge

Presence in 40+ regions worldwide.

Got Questions?

Everything you need to know.

We maintain a 99.9% accuracy rate by constantly updating our proprietary database in real-time. We don't just rely on static lists; our algorithms detect patterns and behaviors of temporary email networks.
Yes! Every account gets 10,000 validation requests per month completely free, forever. You only need to upgrade if your volume exceeds the free tier limits.
Our global edge network guarantees sub-50ms latency in most regions. This means you can validate emails synchronously during the signup flow without your users noticing any delay.
No. We perform deep DNS and MX record inspection and initiate a socket-level SMTP handshake to confirm the mailbox exists, but we drop the connection before an actual email is ever sent. Your sender reputation remains completely untouched.
Extremely easy. It's a standard RESTful API. We offer SDKs for Node.js, Python, Go, and PHP, or you can just make a standard HTTP POST request from anywhere.

Start protecting your app in under 2 minutes.

Join thousands of developers keeping their databases clean and free of disposable bot signups. No credit card required to start.