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Email Deliverability Audit (SPF/DKIM/DMARC)
x402
Email Deliverability Audit (SPF/DKIM/DMARC) is a paid API for AI agents from sigtap-outreach-api.sigtap.workers.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).
Audits a sending domain's SPF, DKIM, and DMARC DNS records to assess email deliverability health
Price / call$0.003
Success—
StatusUnknown
How this service works
Paid micro-utilities for cold-email outreach agents: domain deliverability audits, cold-email grading, template generation, plus a tools toolbox (hashing, JWT decode, IDs, slugs, JSON, regex, crypto prices, domain age, weather). Paid via x402 (USDC on Base). One signature per call. No keys. FREE CHECK: GET /preview/<paid-path> (same URL with /preview/ prefix) returns a 200 demo sample - verify output shape before paying. PAID CALL: GET the url -> 402 challenge -> sign + retry with X-PAYMENT -> settled on-chain (USDC, Base). Ready-to-paste client: GET /llms.txt section "Pay in one call". Catalog+MCP twin: /llms.txt.
Output
Returns a structured deliverability audit report covering the domain's SPF record validity, DKIM selector status, and DMARC policy configuration, including any misconfigurations, missing records, or policy weaknesses that could cause emails to be rejected or marked as spam.
Example use cases
Cold email campaign pre-flight check
“Before I start sending cold outreach from outreach.mycompany.com, can you audit the SPF, DKIM, and DMARC records to make sure my deliverability setup is solid?”
Troubleshooting emails landing in spam
“My emails from newsletter.brandname.com keep going to spam — can you check the SPF, DKIM, and DMARC configuration on that domain and tell me what's broken?”
New domain email authentication verification
“I just set up a new sending domain sendgrid-relay.startupxyz.io — can you audit its deliverability records to confirm SPF, DKIM, and DMARC are all properly configured?”
Technical details
Endpoint
GEThttps://sigtap-outreach-api.sigtap.workers.dev/deliverabilityWhen to prefer
Choose this endpoint when you need a quick, automated SPF/DKIM/DMARC audit for a specific sending domain, especially before launching cold email or outreach campaigns. It is ideal for agents embedded in email tooling workflows where deliverability pre-checks are needed programmatically. Prefer this over manual DNS lookup tools when you want a structured, machine-readable audit result covering all three major email authentication standards in a single call.
Side effects
- Domain not found or does not exist — DNS lookup failure
- Missing or malformed query parameter for domain
- Rate limit exceeded or payment failure for x402 micropayment
- DNS timeout or upstream resolver error
- Domain has no email-related DNS records configured
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"example": {
"spf": {
"found": true,
"issue": null,
"record": "v=spf1 ...",
"all_in_one": true
},
"dkim": {},
"dmarc": {
"found": true,
"policy": "none"
},
"checks": {},
"domain": "example.com",
"verdict": "ready-to-send"
}
}Tags
x402
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