# x402broker Subdomain & Domain Security Recon

> x402broker Subdomain & Domain Security Recon is a paid API for AI agents from x402broker.com, paid per call via x402 or MPP, $0.01/call, status unknown (last checked 2026-10-20).

Scans a domain for live IPv4/IPv6 DNS resolution, TLS certificate issuer/expiry details, and HTTP security header grades via a GET request.

## Facts

- Endpoint: GET https://x402broker.com/v1/subdomain-scan?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402, MPP
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402broker-subdomain-domain-security-recon-6944ebb8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_CvqZoDl_NHS2aW6b8Kptd

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 x402broker-subdomain-domain-security-recon-6944ebb8
```

Example prompt: Can you scan example.com and tell me its DNS resolution (IPv4 and IPv6), who issued its TLS certificate, when it expires, and what its HTTP security header grade is?

## When to prefer this

Use this endpoint when you need a fast, lightweight OSINT snapshot of a domain's DNS health, TLS certificate validity, and HTTP security posture without running a full penetration test. Ideal for pre-launch checks, vendor vetting, or routine security hygiene on a single domain.

## Known failure modes

- Domain does not resolve — DNS lookup failure returned
- Domain has no TLS certificate — certificate data absent or error
- HTTP security headers not accessible — connection refused or timeout
- Invalid domain input — malformed domain string
- Rate limit or payment failure — 402 response if USDC payment not processed

## How this service works

Inspects live IPv4/IPv6 DNS resolution, TLS certificate issuer/expiry, and HTTP security grade. (Live x402 v2, IETF MPP & MCP endpoint at https://x402broker.com/v1/subdomain-scan)

## Output

Returns live IPv4 and IPv6 DNS resolution results, TLS certificate issuer and expiry date, and an HTTP security header grade for the queried domain.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "domain"
 ],
 "properties": {
  "domain": {
   "type": "string",
   "minLength": 1,
   "description": "Target domain name (e.g. anthropic.com, openai.com) for DNS, TLS certificate, and security header OSINT"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402broker-subdomain-domain-security-recon-6944ebb8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402broker.com](https://www.zero.xyz/host/x402broker.com/llms.txt)