Disposable email API · Signup abuse prevention
Block disposable emails before fake signups burn your SaaS budget
Industry baseline: up to 15% of free-trial signups use disposable or burner emails and never convert.
BurnerBlock verifies every signup in real time — blocking temporary inboxes, alias farming, and free-trial abuse before you spend on compute, LLM tokens, or email.
{
"email": "user@tempmail.dev",
"disposable": true,
"risk": 92,
"verdict": "block"
}34ms
p95 API latency
1,000
free requests / month
$25
Pro tier / month
Free trials are getting abused.
Disposable emails and Gmail alias tricks drain infrastructure, skew analytics, and waste your most expensive resources.
API waste on fake accounts
Every bogus signup that triggers a welcome email, an AI completion, or a database row costs real dollars.
Skewed acquisition metrics
Cost per acquisition looks healthy when a slice of signups were never going to convert.
Storage and compute bloat
Stop paying for resources consumed by users who disappear in ten minutes.
One API to detect and block abuse before users enter your system.
Everything to stop signup abuse.
Infrastructure to protect your SaaS from disposable emails, alias farming, and fraudulent accounts.
Disposable email detection
Block temporary and burner providers at signup.
Alias abuse prevention
Normalize Gmail plus-addressing and catch repeated trial abuse.
Domain reputation
Validate MX records, risky providers, and suspicious domains.
Risk scoring engine
Get a clear score and allow/block verdict for every email.
Auth integrations
Works with modern auth providers and frameworks.
AI-friendly documentation
Copy-paste examples built for Cursor and Claude workflows.
ROI calculator
Model your abuse tax.
Most SaaS teams assume 15% of trial spend goes to disposable signups. Adjust the inputs to see annual loss.
Estimated annual loss
$22,500
Hidden spend on accounts that never convert — compute, tokens, email, and database rows.
Not just inbox verification.
Traditional tools check whether an inbox exists. BurnerBlock stops abuse patterns — disposable providers, alias tricks, and repeat trial farming.
- Disposable emails
- Alias farming
- Free-trial abuse
- Low-quality signups
- Domain reputation
- Built for modern SaaS
Developer experience
Integrate in minutes.
No enterprise onboarding. A fast API, clean JSON responses, and copy-paste examples for the stack you already use.
- Single verify endpoint
- Structured risk payload
- Works with Better Auth, Clerk, Supabase
const result = await burnerblock.verify(email)
if (result.blocked) {
return res.status(403).json({
error: "Disposable email detected"
})
}API pricing
Email verification API pricing
Start free while you build. Upgrade when signups grow.
Free
$0/mo
For indie hackers and side projects getting started.
- 1,000 requests included
- Disposable detection
- Alias normalization
- Community support
- Standard latency
Pro
$25/mo
For growing SaaS products that need higher limits.
- 50,000 requests included
- Domain reputation
- Risk scoring engine
- Priority email support
- Edge network latency
- Custom allow/block lists
Built for modern SaaS teams
“Setup took less than 10 minutes and immediately reduced fake signups. Exactly the kind of infrastructure indie hackers need.”
“Feels like it was built by developers who understand modern SaaS.”
“BurnerBlock gives us confidence to scale our free tier without worrying about bot farms.”
Get started
Protect your free tier before abuse gets expensive.
Block burner emails and alias abuse with a single API call at signup.
Get API keys — free tier