# 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 reconnaissance on a domain by resolving IPv4/IPv6 DNS records, inspecting TLS certificate issuer and expiry, and grading HTTP security headers.

## Facts

- Endpoint: GET https://prompt-guard.agentdiet.dev/v1/dns-whois-tls-recon?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-8520d9a4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_UQsCvibL8nniumf6ChoOX

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-8520d9a4
```

Example prompt: Can you run a full security recon on openai.com — I want to see the DNS resolution, TLS certificate issuer and expiry date, and how well their HTTP security headers score?

## When to prefer this

Choose this endpoint when you need a quick, combined OSINT snapshot of a domain's DNS resolution, TLS certificate health, and HTTP security posture in a single call — ideal for security research, vendor due diligence, phishing investigation, or pre-deployment checks. Prefer this over separate DNS or SSL tools when you want all three data points together at low cost.

## Known failure modes

- Domain does not exist or fails to resolve — DNS lookup returns empty or NXDOMAIN
- TLS certificate absent or connection refused — no cert data returned for HTTP-only domains
- Timeout on live probe — endpoint may return error if target host is slow or unresponsive
- Invalid domain input — missing or malformed domain parameter returns validation error
- Target blocks scanning IPs — headers or TLS may be unreachable due to firewall rules

## 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/dns-whois-tls-recon)

## Output

Returns live DNS resolution results (IPv4 and IPv6 addresses), TLS certificate metadata including issuer and expiry date, and an HTTP security headers grade for the target 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-8520d9a4/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)