Stop throwaway emails before they become fake sign-ups
One API call returns a verdict and the reasons behind it — disposable, free provider, invalid or suspected, with how confident we are.
No credit card needed. API access on every plan.
Try it on any address
Check up to 5 addresses a day without an account.
Throwaway inboxes quietly cost you
Fake trial sign-ups
Throwaway addresses claim free trials and promo codes again and again.
Emails that bounce later
Disposable inboxes vanish, so your onboarding and receipts go nowhere.
Metrics you can't trust
Accounts nobody uses inflate your sign-ups and skew every funnel.
A verdict with its reasons, not a yes or no
Every check says what it found and why: on a known blocklist, a free provider, no mail server, a domain registered last week. Suspected addresses come with a confidence band.
- Seven verdicts
- Reasons with their signals
- A confidence band for suspected domains
Catches new throwaway domains, not just the known ones
Public lists are synced every hour, and every unknown domain is inspected: its mail servers, its age, and whether it shares infrastructure with known throwaway services. New candidates are reviewed by our team before they're confirmed.
- Lists synced hourly
- Mail-server and domain-age evidence
- New domains reviewed by people
Your rules always win
Allow a partner's domain or block an address you've seen abuse your product. Workspace rules override our verdict on every check.
- Allow or block domains
- Allow or block single addresses
- Applied to every check
Private by design
We never store an email address in plain text. You choose what your check history keeps, and old checks are deleted on your schedule.
- Never stores plain-text addresses
- Choose what history keeps
- Retention from 30 days to forever
Live in three steps
Start for free- 01
Create a token
Sign up and create a developer token. Every plan includes API access.
- 02
Check on every sign up
Send the new user's email address to
POST /api/v1/checksbefore you create their account. - 03
Act on the verdict
Block disposable addresses, allow the rest, and review the suspected ones in your log.
Everything around the check
Dashboard and stats
Checks, blocks and block rate over 7, 30 or 90 days.
Check history
Every check with its verdict, searchable by domain or address.
Export
Download your history as CSV or JSON.
Re-checks
When a domain is cleared, past checks are flagged so you can re-check them.
English and Spanish
Reason messages come back in your users' language.
API on every plan
From the free plan up.
Pricing that grows with your sign-ups
Starter
For individuals and small teams.
Features:
- 10,000 email checks per month
- API access
Professional
Most popularFor growing businesses.
Features:
- 50,000 email checks per month
- API access
Questions, answered
Start blocking throwaway sign-ups today
Create your account, make a token and send your first check today.
No credit card needed.