verifykit
Real-time + bulk · 97%+ accuracy

Verify email addresses
that actually exist

Real SMTP confirmation, typo correction, disposable filtering — one API call at signup, bulk CSV for spring cleaning.

Try it freeRead docs

Where email verification fits

Six common places teams plug it in. Same API, different surfaces.

User signup forms

Verify at registration time. Catch typos and fake addresses before they hit your database.

Email marketing

Clean lists before campaigns. Lower bounce rates protect your sender reputation across providers.

Bulk list cleaning

Upload CSVs to verify thousands at once. Export results enriched with verdicts and scores.

CRM data hygiene

Routine sweeps of stale customer data — keep deliverability high as records age.

Lead-form scoring

Score inbound leads in real time. Send valid corporate addresses straight to sales.

Onboarding & SSO

Verify the email before issuing magic links, OTPs, or invitations to the wrong inbox.

Two ways

Real-time or bulk — your call

Same scoring pipeline, two surfaces. Pick the one that fits the moment.

Real-time API

POST a single email to /v1/verify. ~200ms response. Drop it into signup, login, lead-capture — anywhere a real address matters.

curl -X POST https://api.verifykit.io/v1/verify \
  -H "Authorization: Bearer vk_live_..." \
  -d '{"email": "jane@stripe.com"}'

Bulk via CSV / API

Upload a CSV through the dashboard or POST a JSON array to /v1/verify/bulk. Up to 1,000 addresses per request — batched higher.

curl -X POST https://api.verifykit.io/v1/verify/bulk \
  -H "Authorization: Bearer vk_live_..." \
  -d '{"emails": ["a@x.io", "b@y.io"]}'

Simple pricing

Cancel anytime · 14-day money-back guarantee.

20% off · first 3 months

Starter

$7.20/ mo
$920% off
$0.0018 / validation
  • 5,000 validations / month
  • real SMTP verification
  • single API key
  • validation history
Get Starter
20% off · first 3 months

Growth

$15.20/ mo
$1920% off
$0.0013 / validation
  • 15,000 validations / month
  • bulk validation
  • real SMTP verification
  • email OTP 2FA (25k/mo)
Get Growth
20% off · first 3 months

Pro

$39.20/ mo
$4920% off
$0.001 / validation
  • 50,000 validations / month
  • unlimited API keys
  • duplicate removal
  • webhooks & callbacks
Start with Pro
20% off · first 3 months

Unlimited

$199.20/ mo
$24920% off
$0.0001 / validation
  • unlimited validations
  • all Pro features
  • dedicated support
  • fair use up to 5M/mo
Get Unlimited

Email verification FAQ

How accurate is email verification?
97%+ for addresses where SMTP verification succeeds. Catch-all domains and providers that block verification are flagged as “risky” rather than guessed at.
Real-time or bulk — which should I use?
Real-time at sign-up / form-submit. Bulk for periodic list cleaning and CRM hygiene. Both share the same scoring pipeline.
Will my emails be sent during verification?
No. SMTP verification negotiates up to RCPT TO and disconnects. The message body is never sent — the user never knows.
Can I verify email addresses for free?
You can try the live API in the playground with no signup. Production keys start at $9/mo with a 14-day money-back guarantee.
Do I need an SDK?
No, plain HTTP works. We do publish official SDKs for Node.js and PHP if you want typed responses + retries baked in.

Start verifying email addresses

Real-time at signup. Bulk for the rest. One API, one verdict.

Get startedTry it free