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Proofwire Email Delivery Verification
x402
Proofwire Email Delivery Verification is a paid API for AI agents from verify.reversecaptcha.fun, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-21).
Polls a Proofwire seed inbox to confirm email delivery and returns SPF/DKIM/DMARC authentication alignment results with Ed25519-signed evidence
Price / call$0.01
Success—
StatusUnknown
How this service works
Close the loop on your own work with one paid call that returns a verdict plus Ed25519-signed, falsifiable evidence (verify signatures with GET /v1/keys). GET /v1/verify/http checks a URL is alive (redirect chain, TLS, latency, body hash). GET /v1/verify/dns resolves records and parses SPF/DMARC/DKIM. Email: POST /v1/verify/email/inbox issues a seed address; send mail to it, then GET /v1/verify/email?inbox=&token= returns delivery plus SPF/DKIM/DMARC alignment and raw headers (polls inside the paid window are free). Webhooks: POST /v1/verify/webhook arms a tripwire URL; register it upstream, then poll GET /v1/verify/webhook/{id}?token= for free. GET /v1/verify/page renders a page in a real browser, asserts a selector/text, and returns a screenshot URL. Failed work is never settled.
Output
Returns a verdict field ('delivered' or failure), the raw email headers including Received lines, per-mechanism authentication results (SPF pass/fail, DKIM result and alignment flag, DMARC result), the timestamp of delivery, and the entire evidence bundle signed with an Ed25519 key verifiable via GET /v1/keys.
Example use cases
Transactional email delivery audit
“I just sent a password-reset email from my app — can you check Proofwire inbox 'inbox_reset42' with token 'tok_abc001' to confirm it was delivered and that DKIM alignment passed?”
New domain email authentication check
“I've set up SPF, DKIM, and DMARC on my new domain sendgrid-test.io and fired off a test message — poll Proofwire inbox 'inbox_dom99' with token 'tok_dom99sec' and tell me the full authentication verdict including raw headers.”
Email marketing platform validation
“My marketing platform claims it sends authenticated mail — I triggered a campaign email just now, please poll Proofwire inbox 'inbox_mkt77' with token 'tok_mkt77key' and confirm DMARC passed and DKIM was aligned.”
Technical details
Endpoint
GEThttps://verify.reversecaptcha.fun/v1/verify/email?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need cryptographically signed proof that an email was actually delivered and authenticated — not just that an SMTP server accepted it. It is the right choice when you want SPF/DKIM/DMARC alignment details bundled with falsifiable evidence, especially in agentic pipelines where 'closing the loop' on sent email matters. Prefer it over SMTP delivery logs or open-tracking pixels when tamper-proof audit trails are required.
Side effects
- Email not yet delivered within polling window — verdict may be pending or undelivered
- Invalid or expired token returns 401/403
- Inbox ID not found returns 404
- SPF/DKIM/DMARC failures reflected in verdict but not an API error — verdict will indicate failure rather than delivery
- Payment not settled (x402) — call blocked before execution
- Rate limiting or window expiry if polled outside the paid window
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"verdict": "delivered",
"evidence": {
"message": {
"raw_headers": "Received: ...",
"received_at": "2026-01-01T00:00:00Z",
"authentication": {
"spf": {
"result": "pass"
},
"dkim": [
{
"result": "pass",
"aligned": true
}
],
"dmarc": {
"result": "pass"
}
}
}
}
}
}Tags
x402
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