# 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/whois-lookup?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-d1e60aca
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_EhgvVmo1M_9bB0aSsp9u5

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-d1e60aca
```

Example prompt: Can you run a full OSINT recon on anthropic.com — I want to see its live DNS resolution, TLS certificate issuer and expiry date, and how its HTTP security headers grade out?

## When to prefer this

Use this endpoint when you need a lightweight, pay-per-call passive recon snapshot of a domain covering DNS, TLS, and HTTP security headers in a single call — ideal for vendor due diligence, pre-integration security checks, certificate expiry monitoring, or OSINT pipelines. Prefer this over full port-scanning or active vulnerability scanners when you want non-intrusive, read-only reconnaissance without triggering IDS alerts.

## Known failure modes

- Domain does not exist or cannot be resolved — DNS lookup failure returned
- Domain is unreachable over HTTPS — TLS certificate details unavailable
- Malformed domain input — validation error on the domain parameter
- Domain resolves but drops HTTP connections — security headers cannot be retrieved
- Rate limiting or payment failure — HTTP 402 returned requiring USDC micropayment

## 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/whois-lookup)

## Output

Returns live DNS resolution results including IPv4 and IPv6 addresses, TLS certificate metadata such as issuer and expiry date, and an HTTP security header audit with a grade or assessment 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/prompt-guard-agentdiet-dev-domain-osint-tls-certificate-security-d1e60aca/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)