# Domain OSINT, TLS Certificate & Security Headers Recon

> Domain OSINT, TLS Certificate & Security Headers Recon is a paid API for AI agents from sec-intel.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 any target domain.

## Facts

- Endpoint: GET https://sec-intel.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: sec-intel.agentdiet.dev
- Website: https://sec-intel.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/sec-intel-agentdiet-dev-domain-osint-tls-certificate-security-headers-47f8093c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zNX9OWRJGvnkOVV_LtRWf

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 sec-intel-agentdiet-dev-domain-osint-tls-certificate-security-headers-47f8093c
```

Example prompt: Can you pull up the DNS records, TLS certificate details, and HTTP security grade for stripe.com so I can check if their cert is still valid and what security headers they're serving?

## When to prefer this

Choose this endpoint when you need a combined DNS + TLS certificate + HTTP security header snapshot for a domain in a single call, especially for OSINT reconnaissance, vendor risk assessment, or pre-deployment security checks. Prefer this over manual certificate transparency log searches or separate DNS/SSL tools when you want a unified security posture summary.

## Known failure modes

- Invalid or non-existent domain returns an error or empty DNS results
- Domain resolves but TLS handshake fails if port 443 is not open
- Firewall or rate-limiting on the target domain may cause timeouts
- Private/internal domains not reachable from the public internet will fail to resolve
- Payment failure via x402 prevents the call from completing

## 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://sec-intel.agentdiet.dev/v1/cert-transparency)

## Output

Returns live IPv4 and IPv6 DNS resolution results, TLS certificate metadata (issuer, expiry date, validity status), and an HTTP security header grade reflecting the presence and quality of headers like HSTS, CSP, X-Frame-Options, etc.

## 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/sec-intel-agentdiet-dev-domain-osint-tls-certificate-security-headers-47f8093c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from sec-intel.agentdiet.dev](https://www.zero.xyz/host/sec-intel.agentdiet.dev/llms.txt)