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AssetFactory Email Verification
x402
AssetFactory Email Verification is a paid API for AI agents from assetfactory-jobs-x402.sigrunner.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-11-03).
Verifies email deliverability for up to 100 addresses at once, returning MX routing, SPF/DMARC posture, disposable/role/free-provider flags, typo suggestions, and an A–F grade — all via DoH, no SMTP probe.
Price / call$0.002
Success—
StatusUnknown
How this service works
Email verification: one deliverability record per address — MX / implicit-MX routing (RFC 5321), SPF + DMARC posture, disposable / role / free-provider flags against a loop-maintained throwaway-domain corpus, a derived typo "did-you-mean" and an A-F grade. Keyless (DoH); no SMTP mailbox probe. Params: emails (max 100), checkSenderPosture.
Output
Returns a JSON object with a count, aggregate stats (deliverable, undeliverable, risky, requested), and one record per email address. Each record includes: deliverability status, A–F grade, numeric score, MX found flag, SPF/DMARC presence and policy, disposable/role/free-provider boolean flags, email provider name, syntax validity, and a did-you-mean typo suggestion if applicable.
Example use cases
Pre-send email list hygiene
“I have a list of 50 leads I'm about to email — can you run them through email verification and tell me which ones are undeliverable, disposable, or role accounts so I can clean the list before I send?”
CRM signup fraud detection
“A new user just signed up with the email temp-user@guerrillamail.com — can you quickly verify whether it's a real deliverable address or a throwaway, and flag if it's a free or role account?”
Outbound sender domain audit
“Before we launch our cold outreach campaign from sales@ourstartup.io, can you check if our sending domain has proper SPF and DMARC records set up and tell me our spoofability risk?”
Technical details
Endpoint
GEThttps://assetfactory-jobs-x402.sigrunner.workers.dev/email/verify?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need bulk email validation (up to 100 at once) without triggering SMTP probes — ideal for compliance-sensitive scenarios. It's distinctive for its loop-maintained disposable-domain corpus, typo suggestions, and combined SPF/DMARC sender-posture signals in a single call. Prefer it over SMTP-based verifiers when avoiding mailbox probing is required, or when you need structured deliverability grades alongside DNS-level sender reputation signals.
Side effects
- Invalid or malformed email addresses return syntax errors in the record
- Domains with no public DNS records may return mx_found: false and undeliverable status
- Rate or batch limits exceeded if more than 100 emails submitted at once
- DoH resolution timeouts may cause delays or missing MX data for obscure domains
- Missing or misconfigured DMARC records cause dmarc_present: false without a hard failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"count": 1,
"stats": {
"risky": 0,
"verified": 1,
"requested": 1,
"deliverable": 1,
"undeliverable": 0
},
"records": [
{
"email": "jane@stripe.com",
"grade": "A",
"score": 100,
"domain": "stripe.com",
"reasons": [
"clean"
],
"mx_found": true,
"deliverable": "deliverable",
"spf_present": true,
"did_you_mean": null,
"dmarc_policy": "reject",
"valid_syntax": true,
"dmarc_present": true,
"is_disposable": false,
"email_provider": "Google Workspace",
"is_role_account": false,
"is_free_provider": false
}
],
"generated_at": "2026-10-30T00:00:00.000Z"
}
}Tags
x402
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