# 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/ssl-audit?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-dd5053d0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4FQgn8wBYaLf_bMMSm24o

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-dd5053d0
```

Example prompt: Can you run a full DNS, TLS certificate, and HTTP security header audit on openai.com and tell me who issued the cert, when it expires, and what security grade it gets?

## When to prefer this

Choose this endpoint when you need live, real-time OSINT on a domain's DNS resolution, TLS certificate chain, and HTTP security posture in a single call. Prefer it over manual lookups or separate tools when you want a combined security grade alongside cert issuer/expiry and IPv4/IPv6 DNS data without stitching multiple services together.

## Known failure modes

- Domain does not exist or cannot be resolved — DNS lookup failure returned
- Domain is reachable but has no TLS certificate (HTTP-only) — certificate fields may be null or absent
- Domain parameter missing — 400 Bad Request
- Target host times out during live inspection — timeout error
- Payment not made or invalid — HTTP 402 payment required before response is 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/ssl-audit)

## Output

Returns live DNS resolution results (IPv4 and IPv6 addresses), TLS certificate details (issuer, expiry date, validity status), and an HTTP security header grade reflecting the presence and strength of headers like HSTS, CSP, X-Frame-Options, and related 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-dd5053d0/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)