An email validation API that verifies every signup in real time. One call per address, Inbox, Caution or Remove back. Stop bad data at the door. First 1,000 free.
You need an email validation API because bad addresses are getting in faster than you can clean them out. Every signup form, every checkout, every lead import is a door. Leave it open and your list rots between sends. Listgevity closes it: one call per address, in real time, with a verdict you can act on. Inbox, Caution or Remove.
An email validation API checks an address the moment it is captured, before it ever lands on your list. You send one address to one endpoint, you get one structured answer back. A basic check returns valid, invalid, or unknown and leaves you the unknowns. Listgevity returns a verdict: Inbox the good ones, Caution the risky, Remove the dead, with the reason on each. Verify at the point of capture and your list never rots in the first place.
No SDK to wrestle, no dashboard to babysit.
Point your form or app at one endpoint. Pass one email. Get back Inbox, Caution or Remove, plus the reason, as structured data you can branch on.
Accept the Inbox ones. Flag the HOLDs for a second look. Block the DROPs before they cost you a bounce.
Same verdict language you get on a bulk clean, now firing at the exact second someone types their address.
Cleaning a list after the fact is mopping the floor with the tap still running. Real-time validation shuts the tap.
Every dead address you keep out is a bounce that never happens, an ESP fee you never pay, and a hit to your sender reputation you never take. The cheapest address to remove is the one that never got in.
That is the ROI: you are not paying to store, mail, and later scrub junk data. You are refusing it at the door for the cost of one API call.
You do not need an engineer for this.
Drop the call into n8n, Make, or Zapier and gate any signup, form, or CRM add on the verdict. New lead comes in, Listgevity reads it, your automation routes it. Inbox goes to the list, Caution goes to review, Remove never makes it in.
The same endpoint runs behind a no-code flow or straight in your own stack. Your pace, your setup.
A basic check tells you a mailbox exists and stops there. That leaves the judgment call, the part that actually costs money, on you. Listgevity makes the call on every request:
| On every call | What it means |
|---|---|
| Inbox | Safe to accept. Let it on the list. |
| Caution | Risky. Here is why. Route it for a second look. |
| Remove | Dead weight. Block it before it costs you a bounce. |
One address in, one decision out. Build your signup logic on that.
Run your list through Listgevity and get Inbox, Caution or Remove on every address, with the reason.
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