# 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 (IPv4/IPv6), TLS certificate inspection (issuer/expiry), and HTTP security header grading for a given domain

## Facts

- Endpoint: GET https://prompt-guard.agentdiet.dev/v1/cert-transparency?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-8b971a49
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_OQsiWNF5VihmxGcy1SWLa

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-8b971a49
```

Example prompt: Can you run a full security recon on anthropic.com — I want to see its DNS resolution, who issued its TLS certificate, when it expires, and how its HTTP security headers grade out?

## When to prefer this

Choose this endpoint when you need a combined, single-call OSINT snapshot of a domain's DNS, TLS, and HTTP security posture rather than querying separate tools. Ideal for security audits, vendor risk assessments, certificate expiry checks, and reconnaissance workflows where live data is required.

## Known failure modes

- Domain does not exist or fails DNS resolution — may return error or empty DNS fields
- Domain has no TLS certificate — certificate fields will be absent or null
- Domain is unreachable (firewall, rate-limit) — timeout or connection error
- Invalid domain format — validation error on the domain parameter
- Domain resolves but returns no security headers — security grade may be low or missing

## 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/cert-transparency)

## Output

Returns live DNS resolution results (IPv4 and IPv6 addresses), TLS certificate metadata (issuer, validity dates, expiry), and an HTTP security header grade/assessment 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-8b971a49/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)