# 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 headers grading for a given domain.

## Facts

- Endpoint: GET https://sec-intel.agentdiet.dev/v1/subdomain-scan?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-91fcbbc9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dKDCCL4W-rd37r_4r5Zg1

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-91fcbbc9
```

Example prompt: Can you run a full domain security recon on stripe.com — I want to see its DNS resolution, TLS certificate issuer and expiry date, and how it scores on HTTP security headers?

## When to prefer this

Choose this endpoint when you need a single-call live recon of a domain's DNS, TLS certificate, and HTTP security posture without deploying your own scanning infrastructure. Ideal for security due diligence, vendor assessments, certificate expiry monitoring, and lightweight OSINT workflows. Prefer this over full vulnerability scanners when you need fast, targeted, read-only intelligence on a domain's security configuration rather than a deep penetration test.

## Known failure modes

- Domain does not exist or has no DNS records — returns empty or error response
- Domain blocks probing — TLS or header data may be unavailable
- Invalid domain format supplied — validation error returned
- Network timeout reaching the target domain — partial or no data returned
- Domain resolves but has no HTTPS — TLS certificate data absent

## 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/subdomain-scan)

## Output

Returns live DNS resolution data (IPv4 and IPv6 addresses), TLS certificate metadata (issuer, expiry date, chain details), and an HTTP security headers assessment/grade for the target domain, all gathered in real time against the live host.

## 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-91fcbbc9/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)