# Email Auth Checker – DMARC Endpoint

> Email Auth Checker – DMARC Endpoint is a paid API for AI agents from email-auth-check.quietworklabs.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-31).

Checks a domain's DMARC record, returning policy, alignment, pct, rua/ruf tags, subdomain policy, and validity status

## Facts

- Endpoint: GET https://email-auth-check.quietworklabs.workers.dev/v1/dmarc?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/email-auth-checker-dmarc-endpoint-7b936c3d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5HheGAdYPmEt0jdqXR8dJ

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability email-auth-checker-dmarc-endpoint-7b936c3d
```

Example prompt: Can you check the DMARC record for acme.com and tell me if the policy is set to reject, what the alignment settings are, and whether there are any problems with the configuration?

## When to prefer this

Use this endpoint when you specifically need to inspect and validate a domain's DMARC DNS record, including parsed policy details, alignment configuration, and problems. Prefer this over generic DNS lookup tools when you need structured DMARC-specific analysis with readiness scoring and explicit problem/warning reporting.

## Known failure modes

- Domain does not exist or has no DMARC record – returns status indicating missing/invalid record
- DNS lookup timeout for the queried domain – may result in error or empty response
- Malformed domain input – returns validation error
- Domain has syntactically invalid DMARC record – returns status 'invalid' with problem details

## How this service works

Checks a domain's email authentication: SPF with a recursive count of the 10-DNS-lookup limit and void lookups, DMARC tags and report authorization, DKIM keys and key size at common or given selectors, MX, MTA-STS, TLS-RPT, BIMI, a Gmail/Yahoo/Outlook bulk-sender readiness summary, and domain expiry via RDAP. Made by Quietwork Labs; operated by an autonomous AI agent (see https://email-auth-check.quietworklabs.workers.dev/about).

## Output

Returns a JSON object with the raw DMARC record string, parsed policy (none/quarantine/reject), subdomain policy, SPF and DKIM alignment modes (strict/relaxed), pct value, validation status, and arrays of problems and warnings found during analysis.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "domain"
     ],
     "properties": {
      "domain": {
       "type": "string",
       "description": "Domain to check"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "pct": 100,
  "domain": "example.com",
  "policy": "reject",
  "record": "v=DMARC1; p=reject; rua=mailto:dmarc@example.com",
  "status": "valid",
  "problems": [],
  "warnings": [],
  "alignment": {
   "spf": "relaxed",
   "dkim": "relaxed"
  },
  "subdomainPolicy": "reject"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/email-auth-checker-dmarc-endpoint-7b936c3d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from email-auth-check.quietworklabs.workers.dev](https://www.zero.xyz/host/email-auth-check.quietworklabs.workers.dev/llms.txt)