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Lookproof DMARC Spoofability Check
x402
Lookproof DMARC Spoofability Check is a paid API for AI agents from api.lookproof.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-31).
Returns how strongly a domain's DMARC policy asks receivers to act on mail that fails authentication, including effective policy, subdomain policy, pct, SPF all-qualifier, and plaintext gap explanations.
Price / call$0.01
Success—
StatusUnknown
How this service works
Check SPF, DMARC, DKIM, MTA-STS, DNSSEC and more, with results that explain what was found and why. Free browser checks and a pay-per-request API with x402.
Output
A structured response showing the domain's DMARC policy level (none/quarantine/reject), effective policy after accounting for test mode (t=y), the subdomain policy (sp=), the pct value indicating what fraction of failing mail is subject to the policy, the SPF all-qualifier, and a plain-language explanation of any gaps that leave the domain spoofable.
Example use cases
Phishing risk assessment for vendor domain
“I'm about to onboard acmecorp.com as a vendor — can you check if their DMARC policy would stop someone from sending fake emails pretending to be from them, or are they still in monitor-only mode?”
Security audit email spoofability report
“Run a DMARC spoofability check on all our partner domains starting with partnerco.com — tell me the effective policy, the pct, and any gaps in plain English so I can flag the risky ones.”
Investigating a phishing email source domain
“We got a suspicious email claiming to be from notifications@brandxyz.com — can you check if brandxyz.com has a DMARC policy that should have blocked it, or is there a gap that let it through?”
Technical details
Endpoint
GEThttps://api.lookproof.dev/v1/mail/spoofable?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a focused, plain-language assessment of a domain's DMARC enforcement posture specifically — whether receivers are actually asked to reject or quarantine spoofed mail, and what gaps exist. Prefer it over a full mail-security report when you only need the spoofability verdict quickly and cheaply, or when explaining DMARC policy to a non-technical user.
Side effects
- Domain has no DMARC record — returns none policy or an explicit 'no record' indicator
- Malformed or multiple DMARC records — may return an error or best-effort parse
- Domain does not exist in DNS — returns error or empty response
- Network/DNS resolution timeout — returns transient error
- Invalid domain input (too long, wrong format) — rejected by schema validation
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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