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SDN Screen Email Authentication Check (x402)
x402
SDN Screen Email Authentication Check (x402) is a paid API for AI agents from sdn-screen-x402.sdnscreen.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-11).
Checks SPF, DMARC, and DKIM email authentication records for a given domain, returning a grade and scored issue report, paid per-call via x402 at $0.01 USDC.
Price / call$0.01
Success—
StatusUnknown
How this service works
Six keyless pay-per-call tools for AI agents: OFAC SDN crypto-wallet screen, live DNS records lookup, SPF/DMARC/DKIM email-auth check, domain age/registrar (RDAP), email address MX verify and URL unshorten/redirect check. $0.01 per call: USDC on Base over x402, or USDC on Tempo over MPP. Also a remote MCP server at /mcp (x402).
Output
Returns a JSON object with SPF presence and DNS lookup count and all-qualifier, DKIM found selectors and key types, DMARC policy and presence, an overall letter grade (e.g. 'B'), a numeric score (0-100), the queried domain, and a list of issues each with a code, human-readable message, and severity level.
Example use cases
Vendor email security audit
“Before we start wiring payments to this new supplier, can you check whether their domain invoices-fastpay.com has proper SPF, DMARC, and DKIM set up, and flag any issues?”
Phishing risk assessment for counterparty
“I got an email from someone at partnercorp-global.net — can you look up their email authentication records and tell me if their domain is protected against spoofing?”
Pre-send domain health check
“We're about to launch an email campaign from our new domain brightleaf-marketing.com — can you check our SPF, DMARC, and DKIM configuration and give us a score so we know if anything needs fixing first?”
Technical details
Endpoint
GEThttps://sdn-screen-x402.sdnscreen.workers.dev/v1/email-auth?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a live, per-call email authentication audit (SPF, DMARC, DKIM) for any domain without requiring API key signup, and you want a scored, graded result with actionable issue codes. It is ideal for AI agents running automated vendor due diligence, phishing-risk checks, or email deliverability audits on-demand. Prefer it over full email security platforms when you need lightweight, pay-as-you-go access with no subscription overhead.
Side effects
- Missing required 'domain' query parameter returns an error
- Non-existent or unreachable domain may return empty or partial DNS results
- Payment not received or x402 handshake fails — call is rejected before processing
- Malformed domain string may cause DNS lookup failure
- Temporary DNS resolution errors may yield incomplete DKIM/SPF data
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"mx": {
"nullMx": false,
"records": [
{
"host": "smtp.google.com",
"priority": 10
}
]
},
"spf": {
"record": "v=spf1 include:_spf.google.com ~all",
"present": true,
"dnsLookups": 1,
"allQualifier": "~all"
},
"dkim": {
"found": [],
"selectorsChecked": [
"google",
"selector1",
"selector2",
"default",
"k1",
"k2",
"s1",
"s2",
"dkim",
"mail",
"mandrill",
"pm",
"zoho",
"protonmail",
"fm1"
]
},
"note": "Reads public DNS only; sends no mail. DKIM is checked at the given selector plus common selectors.",
"dmarc": {
"pct": 100,
"rua": "mailto:mailauth-reports@google.com",
"policy": "reject",
"record": "v=DMARC1; p=reject; rua=mailto:mailauth-reports@google.com",
"present": true,
"subdomainPolicy": null
},
"grade": "A",
"score": 97,
"domain": "google.com",
"issues": [
{
"code": "dkim_not_found",
"message": "No DKIM key found at the checked selectors (pass selector= if you know it).",
"severity": "low"
}
],
"resolver": "Cloudflare 1.1.1.1 (DNS over HTTPS)",
"checkedAt": "2026-10-11T23:55:37.407Z"
}
}Tags
x402
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