# 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 a given domain.

## Facts

- Endpoint: GET https://x402-audit.agentdiet.dev/v1/tls-scanner?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-d96597af
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Cf0AnjQhOaDAP2dttyT50

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-d96597af
```

Example prompt: Can you scan anthropic.com and tell me its DNS resolution, TLS certificate issuer and expiry date, and how it grades on HTTP security headers?

## When to prefer this

Choose this endpoint when you need a combined, single-call view of a domain's DNS resolution, TLS certificate health, and HTTP security header posture — particularly for security audits, vendor due diligence, OSINT investigations, or monitoring certificate expiry. It is more convenient than stitching together separate DNS lookup, SSL checker, and security header tools.

## Known failure modes

- Domain does not exist or fails DNS resolution — returns error or empty DNS result
- Domain is unreachable or times out during TLS handshake — TLS fields may be null or an error is returned
- Domain has no HTTPS support — TLS certificate fields will be absent
- Invalid domain format provided — returns validation error
- Payment not completed (x402) — request is rejected with HTTP 402

## 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/tls-scanner)

## Output

Returns live DNS resolution results (IPv4 and/or IPv6 addresses), TLS certificate metadata (issuer, subject, expiry date, validity status), and an HTTP security headers audit including presence and grading of headers such as HSTS, CSP, X-Frame-Options, and an overall security grade for the scanned 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/x402-audit-agentdiet-dev-domain-osint-tls-certificate-security-d96597af/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)