Detect disposable emails before they wreck your signups
Stop fake signups, prevent trial abuse, and maintain high-quality user data with a detection engine that updates itself in real time.
Check an email domain in one API request before creating the account.
{
"email": "user@temp-mail-xyz-99.net"
}{
"domain": "temp-mail-xyz-99.net",
"verdict": "disposable",
"confidence": 0.99,
"reason": "AI_SCRAPER_MATCH",
"recommended_action": "block"
}Used by teams building signup flows
The Static List Fallacy
Stale blocklists miss new temp-mail domains. Static lists are outdated the moment they're published — bad actors spin up new domains faster than human curators can track them.
Tempo Checker solves this with active monitoring.
DOMAIN: temp-mail-xyz-99.net
STATUS: Known disposable
ACTION: Blocked
How it fits into signup
Receive the email
User submits their email address in your registration or trial form.
Call the API
Send a lightweight POST request to Tempo Checker. We return a verdict in <50ms.
Choose Outcome
Block known disposables, show a soft warning for suspicious domains, or approve real users instantly.
Our Verification Engine
Domain List Match
High-speed lookup against known disposable providers. Our foundational cache processes millions of established bad domains in milliseconds.
DNS/MX Validation
Real-time verification of mail server records and domain health. We verify that the domain can actually receive mail right now.
AI Scraper Agent
Our proprietary agent constantly crawls the web to identify new temporary email services before they hit common lists.
What that actually gets you
Stop paying for fake trials
Every disposable signup that slips through is a free-tier seat or trial you're funding for nobody. Cut it off at the form.
Protect your sender reputation
Bounces from dead temp-mail inboxes drag down deliverability for every real customer on your list. Keep your domain clean.
Trust your growth metrics
Activation and conversion rates mean something again once bot and burner accounts stop diluting the numerator.
Ship it in an afternoon
One POST request at signup. No infra to run, no list to maintain — we push new domains to the API continuously.
Teams who cleaned up their signups
"We cut fake trial signups by 34% in the first week. It paid for itself before the first invoice."
"Integration took less time than writing the ticket to ask for it. Genuinely a 20-minute job."
"Our bounce rate on welcome emails dropped almost immediately. Deliverability team was thrilled."
Questions, answered
How is this different from a blocklist I could get for free?
Free lists are a snapshot from whenever they were last published. Our scraper agent and DNS/MX layer catch domains that spun up in the last few hours, not the last few months.
Will this ever block a real customer?
Every verdict comes with a confidence score and reason, so you decide whether to hard-block, soft-warn, or just flag for review — you're never locked into an all-or-nothing rule.
How fast is the API in production?
Median response time is under 50ms, so it sits comfortably in a signup form's validation step without adding perceptible lag.
Do you store the emails I send you?
No — we check the domain in real time and don't retain the full address. Full details are in our Privacy Policy.
Start blocking disposable signups today
Start a 7-day free trial today. Cancel anytime. Upgrade whenever your signup volume outgrows the trial limit.