Verification that lives inside your stack.
No more export-clean-reimport. Connect Mailchimp, HubSpot, Klaviyo or SendGrid and verify right where your contacts already live — then watch the verdicts flow back automatically.
100 free verifications · OAuth or API key · no card
Plug into the tools you already run.
Native connectors for the platforms that matter — plus Zapier and a REST API for everything else.
Connect, import, verify, write back.
One loop that runs on its own. Set it up once and your lists stay clean without you touching a CSV again.
Connect
Authorize with OAuth in two clicks, or paste an API key. No CSV exports, no SFTP, no engineering ticket.
Import
We pull your audiences, lists and contact properties — and keep watching for new records as they land.
Verify
Every address runs 20+ checks. Valid, risky, catch-all, disposable and invalid — graded with a confidence score.
Write back
Verdicts flow back to the source: clean stays, invalids get suppressed or archived, risky gets tagged.
Every contact gets a verdict, not a guess.
Here's a typical audience the moment it lands. We grade all of it, then write each result back exactly the way you set — clean stays, invalids go, risky gets flagged.
- Validkept & sendable71%
- Risky / catch-alltagged for review14%
- Invalidsuppressed / archived12%
- Unknownnever charged3%
↳ unknown is never charged · only answers cost credits
Every verdict lands back where it belongs.
We don't just hand you a report and walk away. The result for each address is synced straight to the source — so the next campaign sends to a list that's already been cleaned.
- Suppress or archive invalids automatically in Mailchimp, Klaviyo and SendGrid — no manual cleanup.
- Tag risky and catch-all records in HubSpot so reps see the risk before they hit send.
- You stay in control. Nothing is deleted without the rule you set — confirm-first by default.
| Verdict | Confidence | |
|---|---|---|
| [email protected] | Valid | 0.98 |
| [email protected] | Valid | 0.97 |
| [email protected] | Catch-all | 0.55 |
| [email protected] | Typo | 0.04 |
| [email protected] | Disposable | 0.02 |
| [email protected] | Valid | 0.96 |
Or wire it up yourself.
When a native connector isn't enough, our REST API and webhooks give you the same engine — verify on any event, route on the verdict, and only pay for answers we're sure of.
- One endpoint, one key. Single or batch, sub-second responses, idempotent retries.
- Webhooks on completion so your app reacts the moment a verdict is ready.
- Zapier in between if you'd rather not write code — 7,000+ apps, no deploy.
# Verify a contact the moment it enters HubSpot
curl https://platform.emaillistchecker.io/api/v1/verify \
-H "Authorization: Bearer $ELC_API_KEY" \
-d email="[email protected]"
# → {
# "email": "[email protected]",
# "verdict": "valid",
# "confidence": 0.991,
# "checks": { "mx": true, "smtp": true,
# "catch_all": false, "disposable": false },
# "writeback": "synced:hubspot"
# }Teams plug us in and forget about bounces.
We cut our bounce rate from 11.4% to 0.5% in a week. The AI explaining why each address was risky is the part our team actually loves.
The API drops straight into our signup flow. Fake and disposable emails never make it into the database anymore.
Half the price of the tool we left, and the inbox-placement testing paid for itself on the first campaign.
Everything about connecting.
Connect your stack. Verify free.
100 free verifications, no card. OAuth in two clicks or paste an API key — and your credits never expire.