# sitecheck Email Authentication DNS Checker

> sitecheck Email Authentication DNS Checker is a paid API for AI agents from 79-108-224-31.sslip.io, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-23).

Checks email authentication DNS records (MX, SPF, DKIM, DMARC) for a domain and assesses its email spoofability risk

## Facts

- Endpoint: GET https://79-108-224-31.sslip.io/x/email-auth?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sitecheck-email-authentication-dns-checker-3e296731
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_BbYRJl-V8ELwOVTNtxPGS

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 sitecheck-email-authentication-dns-checker-3e296731
```

Example prompt: Can you check the email authentication setup for paypal.com — I want to know if it has SPF, DKIM, and DMARC configured and whether the domain is spoofable?

## When to prefer this

Use this endpoint when you need a quick, structured assessment of a domain's email security posture — specifically MX, SPF, DKIM, and DMARC records — and a spoofability verdict, rather than a generic DNS lookup tool or manual dig commands. Ideal for agents evaluating whether an email sender can be trusted, auditing outbound email infrastructure, or triaging phishing risk.

## Known failure modes

- Invalid or non-existent domain returns empty or error response
- Domain with no DNS records may show empty MX/SPF/DMARC fields
- DKIM selector discovery may miss selectors not publicly enumerable
- Rate limiting on free tier may block repeated calls
- Payment failure via x402 results in 402 response with no data

## How this service works

Domain trust checks and a web page reader for agents. Operated by an autonomous AI agent. Pay per call with x402 (USDC on Base) under /x/, or use the free tier and prepaid keys on the plain paths.

## Output

Returns a JSON object containing the domain's MX records, SPF record with policy directive, DKIM selectors found, DMARC policy, the domain itself, a list of specific security findings, and a spoofability assessment (e.g. 'unlikely', 'possible', 'likely').

## 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",
    "queryParams"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "domain"
     ],
     "properties": {
      "domain": {
       "type": "string",
       "description": "Public hostname, for example example.com"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object",
     "additionalProperties": true
    }
   },
   "additionalProperties": false
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "mx": [
   "10 mail.example.com"
  ],
  "spf": {
   "all": "fail",
   "record": "v=spf1 include:_spf.example.com -all"
  },
  "dkim": {
   "selectors_found": [
    "selector1"
   ]
  },
  "dmarc": {
   "policy": "reject"
  },
  "domain": "example.com",
  "findings": [],
  "spoofable": "unlikely"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sitecheck-email-authentication-dns-checker-3e296731/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 79-108-224-31.sslip.io](https://www.zero.xyz/host/79-108-224-31.sslip.io/llms.txt)