# Domain OSINT, TLS Certificate & Security Headers Recon

> Domain OSINT, TLS Certificate & Security Headers Recon is a paid API for AI agents from workflows.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 any given domain

## Facts

- Endpoint: GET https://workflows.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: workflows.agentdiet.dev
- Website: https://workflows.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/workflows-agentdiet-dev-domain-osint-tls-certificate-security-headers-88211cc1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_nVxseF0GBwu_H0_V6PzbT

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 workflows-agentdiet-dev-domain-osint-tls-certificate-security-headers-88211cc1
```

Example prompt: Can you run a full DNS, TLS certificate, and security headers recon on anthropic.com — I want to know the IPv4/IPv6 addresses, who issued the SSL cert and when it expires, and what HTTP security grade it gets?

## When to prefer this

Choose this endpoint when you need a quick, live OSINT snapshot of a domain's DNS, TLS, and HTTP security posture without deploying your own scanning infrastructure. Ideal for vendor due diligence, pre-deployment security checks, compliance audits, or threat intelligence workflows where a single domain lookup covering multiple security dimensions is needed at low cost ($0.01/call).

## Known failure modes

- Domain does not exist or fails DNS resolution — returns error or empty DNS records
- Domain is unreachable or times out during TLS handshake — certificate data may be absent
- Domain serves only HTTP (no TLS) — certificate fields will be empty or null
- Invalid or malformed domain string input — returns validation error
- Domain blocks automated HTTP probes — security header grading may be incomplete or unavailable

## 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://workflows.agentdiet.dev/v1/subdomain-scan)

## Output

Returns live DNS resolution data including IPv4 and IPv6 addresses, TLS certificate metadata (issuer, validity dates, expiry), and an HTTP security grade based on the presence and quality of security response headers such as HSTS, CSP, and X-Frame-Options.

## 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/workflows-agentdiet-dev-domain-osint-tls-certificate-security-headers-88211cc1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from workflows.agentdiet.dev](https://www.zero.xyz/host/workflows.agentdiet.dev/llms.txt)