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MailFerret Email Verification
x402
MailFerret Email Verification is a paid API for AI agents from mailferret.appin60.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-22).
Verifies whether a given email address is deliverable using live SMTP checks, returning deliverability status, provider, and spam/catch-all signals
Price / call$0.003
Success—
StatusUnknown
How this service works
Email verification / email validation / bounce check before sending: verify one email address: syntax, MX records, mail provider (Google Workspace, Microsoft 365, ...), catch-all detection, role/free/disposable flags and a live SMTP RCPT check. Returns deliverable, undeliverable, catch_all or no_mx. Inconclusive results (greylisting) return 503 and are not charged.
Output
Returns a JSON object with: deliverable (bool), status string (e.g. 'deliverable'), MX records array, email provider name (e.g. 'google_workspace'), catch_all (bool), disposable (bool), role_account (bool), and free_provider (bool). Charged $0.01 only on successful verification.
Example use cases
Sales lead email validation
“Before I add these prospects to my outreach campaign, can you check if alex.johnson@techcorp.io is a real, deliverable email and not a catch-all or disposable address?”
Preventing bounce on signup
“A user just signed up with sarah.miller@bigcompany.com — can you verify that email is actually deliverable and not a fake or role account like info@ or support@?”
Enriching CRM contact record
“I have a contact at marcus.lee@startupxyz.com — can you verify that email is valid and tell me what email provider they use so I can decide if it's a real work address?”
Technical details
Endpoint
POSThttps://mailferret.appin60.com/verify?utm_source=zero.xyzWhen to prefer
Choose MailFerret when you need real-time, live SMTP verification of individual email addresses with no API key setup — ideal for pay-per-use agent workflows where you only pay on success. Prefer this over bulk verification services when checking one email at a time in an automated pipeline, or when you need detailed signals like catch-all, disposable, and role-account flags alongside deliverability status.
Side effects
- Invalid or malformed email address returns an error or non-deliverable status
- SMTP timeout or temporary server unavailability may cause inconclusive results
- Catch-all servers may respond positively to any address, limiting accuracy
- Payment failure via x402/USDC may prevent the request from completing
- Rate limiting or network issues may cause intermittent failures
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"mx": [
"aspmx.l.google.com"
],
"email": "zeno.rocha@resend.com",
"status": "deliverable",
"provider": "google_workspace",
"catch_all": false,
"disposable": false,
"deliverable": true,
"role_account": false,
"free_provider": false
}
}Tags
x402
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