# Domain OSINT, TLS Certificate & Security Headers Recon

> Domain OSINT, TLS Certificate & Security Headers Recon is a paid API for AI agents from x402-audit.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-21).

Performs live DNS resolution (IPv4/IPv6), TLS certificate inspection (issuer/expiry), and HTTP security header grading for any target domain.

## Facts

- Endpoint: GET https://x402-audit.agentdiet.dev/v1/whois-lookup?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: x402-audit.agentdiet.dev
- Website: https://x402-audit.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/x402-audit-agentdiet-dev-domain-osint-tls-certificate-security-c356a090
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_y-r0JU9RV-Hr4UDUQMqsO

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 x402-audit-agentdiet-dev-domain-osint-tls-certificate-security-c356a090
```

Example prompt: Can you pull the DNS records, TLS certificate details, and HTTP security header grade for anthropic.com — I want to know the issuer, expiry date, and whether the site has proper security headers?

## When to prefer this

Use this endpoint when you need a quick, live, multi-faceted security reconnaissance snapshot of a domain covering DNS, TLS, and HTTP headers in a single call — especially in OSINT, pre-acquisition due diligence, competitive analysis, or certificate expiry monitoring workflows. It is preferable to generic WHOIS-only tools when TLS and security header data are also required.

## Known failure modes

- Domain does not exist or has no DNS records — returns empty or error response
- Domain is unreachable/offline — TLS and header checks may timeout or fail
- Invalid domain string provided — returns validation error
- TLS certificate is self-signed or expired — still returned but flagged
- IPv6 not available for domain — only IPv4 returned

## 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://x402-audit.agentdiet.dev/v1/whois-lookup)

## Output

Returns live DNS resolution results (IPv4 and IPv6 addresses), TLS certificate metadata (issuer, expiry date, validity status), and an HTTP security headers grade reflecting presence or absence of headers like HSTS, CSP, X-Frame-Options, and similar security controls.

## 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/x402-audit-agentdiet-dev-domain-osint-tls-certificate-security-c356a090/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-audit.agentdiet.dev](https://www.zero.xyz/host/x402-audit.agentdiet.dev/llms.txt)