# Email Authentication Check (SPF & DMARC)

> Email Authentication Check (SPF & DMARC) is a paid API for AI agents from domain-dns.x402tookit.com, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-26).

Parses and grades a domain's SPF and DMARC DNS records, assessing policy strength, configuration issues, and spoofing exposure.

## Facts

- Endpoint: GET https://domain-dns.x402tookit.com/email-auth-check?utm_source=zero.xyz
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-26
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/email-authentication-check-spf-dmarc-c53cbc6b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_sEDAG1yvF3U7X5Vgcely-

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-authentication-check-spf-dmarc-c53cbc6b
```

Example prompt: Can you check the email authentication setup for stripe.com — I want to know if their SPF and DMARC records are configured properly and whether the domain could be spoofed?

## When to prefer this

Choose this endpoint when you specifically need to assess a domain's email authentication posture — SPF and DMARC records, policy strength, and spoofing risk — rather than general DNS lookups. It is more focused than a full DNS record dump and provides interpreted verdicts and issue lists rather than raw records only. Prefer it over a generic TXT record lookup when you need structured analysis, policy grading, and actionable issue detection for email security audits.

## Known failure modes

- Domain does not exist — returns null records with an issue indicating the domain is unresolvable
- No SPF record found — SPF present field is false, record is null
- No DMARC record found — DMARC present field is false
- Multiple SPF or DMARC records detected — flagged as a misconfiguration issue
- DNS lookup timeout or resolver failure — degraded flag set to true
- Invalid domain format supplied — input validation error

## How this service works

Grade a domain's email authentication: SPF and DMARC records parsed, policy strength, and spoofing exposure.

## Output

Returns a structured object with the raw SPF record (including all-qualifier, includes, and direct lookups), SPF policy strength, DMARC record (including policy, subdomain policy, pct, alignment modes, and reporting URIs), whether multiple conflicting records exist, a list of issues found, a human-readable summary, an overall spoofing verdict, and a timestamp of when the check was performed.

## 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 that sends mail, e.g. example.com"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "spf": {
       "type": [
        "null",
        "object"
       ],
       "properties": {
        "policy": {
         "type": [
          "null",
          "string"
         ]
        },
        "record": {
         "type": [
          "null",
          "string"
         ]
        },
        "present": {
         "type": [
          "boolean",
          "null"
         ]
        },
        "usesPtr": {
         "type": [
          "boolean",
          "null"
         ]
        },
        "includes": {
         "type": [
          "array",
          "null"
         ],
         "items": {
          "type": "string"
         }
        },
        "multiple": {
         "type": [
          "boolean",
          "null"
         ]
        },
        "allQualifier": {
         "type": [
          "null",
          "string"
         ]
        },
        "directLookups": {
         "type": [
          "null",
          "number"
         ]
        }
       }
      },
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "dmarc": {
       "type": [
        "null",
        "object"
       ],
       "properties": {
        "pct": {
         "type": [
          "null",
          "number"
         ]
        },
        "rua": {
         "type": [
          "null",
          "string"
         ]
        },
        "ruf": {},
        "aspf": {
         "type": [
          "null",
          "string"
         ]
        },
        "adkim": {
         "type": [
          "null",
          "string"
         ]
        },
        "policy": {
         "type": [
          "null",
          "string"
         ]
   
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/email-authentication-check-spf-dmarc-c53cbc6b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from domain-dns.x402tookit.com](https://www.zero.xyz/host/domain-dns.x402tookit.com/llms.txt)