# Domain OSINT, TLS Certificate & Security Headers Recon

> Domain OSINT, TLS Certificate & Security Headers Recon is a paid API for AI agents from alpha-stream.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, and HTTP security header grading for a target domain.

## Facts

- Endpoint: GET https://alpha-stream.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: alpha-stream.agentdiet.dev
- Website: https://alpha-stream.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/alpha-stream-agentdiet-dev-domain-osint-tls-certificate-security-0ef92372
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_O9NPoVitCGWBnRL00P1Du

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 alpha-stream-agentdiet-dev-domain-osint-tls-certificate-security-0ef92372
```

Example prompt: Can you run a full domain OSINT scan on openai.com — I want to see its DNS resolution, TLS certificate issuer and expiry, and how its HTTP security headers are graded?

## When to prefer this

Choose this endpoint when you need live, real-time OSINT on a domain's DNS configuration, TLS certificate health, and HTTP security posture in a single call. It is ideal for security audits, vendor due diligence, pre-acquisition checks, or monitoring certificate expiry — especially when you want both IPv4/IPv6 resolution and TLS issuer details together rather than querying separate DNS or SSL tools.

## Known failure modes

- Domain does not exist or fails DNS resolution — returns error or empty DNS fields
- Domain has no HTTPS/TLS — TLS certificate fields may be absent or null
- Firewall or rate limiting blocks live probing — may return incomplete results
- Invalid domain string input — returns validation error
- Target server unreachable — timeout or connection refused

## 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://alpha-stream.agentdiet.dev/v1/subdomain-scan)

## Output

Returns live DNS resolution results (IPv4 and IPv6 addresses), TLS certificate metadata including issuer and expiry date, and an HTTP security header grade assessing the presence and configuration of headers like HSTS, CSP, and X-Frame-Options 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/alpha-stream-agentdiet-dev-domain-osint-tls-certificate-security-0ef92372/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from alpha-stream.agentdiet.dev](https://www.zero.xyz/host/alpha-stream.agentdiet.dev/llms.txt)