# Domain OSINT, TLS Certificate & Security Headers Recon

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

Performs live DNS resolution, TLS certificate inspection, and HTTP security header grading for a given domain name.

## Facts

- Endpoint: GET https://prompt-guard.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: prompt-guard.agentdiet.dev
- Website: https://prompt-guard.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/prompt-guard-agentdiet-dev-domain-osint-tls-certificate-security-12c8c305
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_nUoOxJSYeQx4WuX5zVnIY

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 prompt-guard-agentdiet-dev-domain-osint-tls-certificate-security-12c8c305
```

Example prompt: Can you run a full DNS, TLS certificate, and security headers audit on anthropic.com — I want to see the certificate issuer, expiry date, IP addresses it resolves to, and the HTTP security grade?

## When to prefer this

Choose this endpoint when you need a quick, all-in-one OSINT snapshot of a domain's DNS posture, TLS certificate health, and HTTP security headers without deploying your own scanning infrastructure. It is particularly useful for security audits, vendor due diligence, pre-launch checklists, or certificate expiry monitoring. Prefer it over general port scanners or manual dig/curl workflows when you need structured, machine-readable output in a single API call.

## Known failure modes

- Domain does not exist or fails DNS resolution — returns error or empty DNS records
- Domain is unreachable or times out during live probe
- TLS certificate is missing or self-signed — may return partial data
- Invalid domain string input — returns validation error
- Rate limiting or payment failure (HTTP 402) if USDC payment is not provided

## 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://prompt-guard.agentdiet.dev/v1/ssl-audit)

## Output

Returns live DNS resolution results (IPv4 and IPv6 addresses), TLS certificate metadata (issuer, expiry date, validity), and an HTTP security header grade reflecting the presence or absence of headers like HSTS, CSP, and X-Frame-Options 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/prompt-guard-agentdiet-dev-domain-osint-tls-certificate-security-12c8c305/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from prompt-guard.agentdiet.dev](https://www.zero.xyz/host/prompt-guard.agentdiet.dev/llms.txt)