99.98% uptime · p95 210ms
Real-time email verification, one API call away.
LookupFox checks syntax, MX records, and live SMTP acceptance, then flags disposable and role addresses — so bad emails never reach your signup table.
100 free credits · no card required
POST /api/v1/verify200 OK
curl -X POST https://www.lookupfox.com/api/v1/verify \
-H "Authorization: Bearer lf_live_1a2b…" \
-H "Content-Type: application/json" \
-d '{"email":"dana.whitfield@northloop.io"}'
-H "Authorization: Bearer lf_live_1a2b…" \
-H "Content-Type: application/json" \
-d '{"email":"dana.whitfield@northloop.io"}'
- "dana.whitfield@northloop.io"
- status
- "valid"
- is_disposable
- false
- is_role_account
- false
- mx_valid
- true
- is_deliverable
- true
Syntax & MX
RFC-compliant parsing plus live DNS lookups on the sending domain.
SMTP handshake
We open a real conversation with the mail server — no sending required.
Disposable & role
A continuously updated list of throwaway domains and shared inboxes.
Confidence score
One number from 0 to 1 you can threshold directly in your signup flow.
Credits, not seats.
One credit per verification. Unused credits roll over for 3 months, and every plan includes the full verification pipeline.