# SiteSignal Email Domain Security

> SiteSignal Email Domain Security is a paid API for AI agents from trinity-throw-thursday-gravity.trycloudflare.com, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-13).

Collects point-in-time DNS evidence for email authentication controls (MX, SPF, DMARC, CAA, MTA-STS, TLS-RPT) for a given domain.

## Facts

- Endpoint: GET https://trinity-throw-thursday-gravity.trycloudflare.com/x402/email-security
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sitesignal-email-domain-security-0b8a696c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tqq7fc9l12DCJVlGPyVsu

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 sitesignal-email-domain-security-0b8a696c
```

Example prompt: Can you pull the email security DNS records for stripe.com — I want to see their MX, SPF, DMARC, MTA-STS, and TLS reporting setup all at once?

## When to prefer this

Choose this endpoint when you need a comprehensive, single-call snapshot of all email authentication DNS controls for a domain — especially MX, SPF, DMARC, CAA, MTA-STS, and TLS-RPT together. It is ideal for security audits, vendor assessments, compliance evidence collection, or pre-send deliverability checks where you want DNS evidence in one structured response rather than running multiple individual DNS queries.

## Known failure modes

- Domain does not exist or has no DNS records — returns empty or error response
- Invalid domain format provided — likely returns a 400 bad request
- DNS lookup timeout for slow or unresponsive nameservers
- MTA-STS policy document not publicly reachable — partial results returned
- DKIM lookup fails if invalid or non-existent selector provided
- Payment not completed — returns 402 Payment Required before data is returned

## How this service works

Collect point-in-time DNS evidence for email authentication controls including MX, SPF, DMARC, CAA, MTA-STS, and TLS reporting.

## Output

A point-in-time snapshot of DNS records relevant to email authentication for the queried domain, including MX server configuration, SPF TXT record and policy, DMARC policy record, CAA records, MTA-STS policy, TLS-RPT reporting endpoints, and optionally DKIM records if a selector is provided. Results reflect the live DNS state at the moment of the request.

## 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"
      },
      "dkimSelector": {
       "type": "string"
      },
      "emailUseCase": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sitesignal-email-domain-security-0b8a696c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from trinity-throw-thursday-gravity.trycloudflare.com](https://www.zero.xyz/host/trinity-throw-thursday-gravity.trycloudflare.com/llms.txt)