# Domain OSINT, TLS Certificate & Security Headers Recon

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

## Facts

- Endpoint: GET https://preflight.agentdiet.dev/v1/domain-osint?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: preflight.agentdiet.dev
- Website: https://preflight.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/preflight-agentdiet-dev-domain-osint-tls-certificate-security-headers-fa82a7d0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xMftXjlvsz5bSQC_XOgq8

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 preflight-agentdiet-dev-domain-osint-tls-certificate-security-headers-fa82a7d0
```

Example prompt: Can you run a security recon on stripe.com — check what IPs it resolves to, who issued its TLS certificate and when it expires, and how its HTTP security headers grade?

## When to prefer this

Choose this endpoint when you need a quick, combined OSINT snapshot of a domain's DNS posture, TLS certificate health, and HTTP security header configuration in a single call, rather than querying separate DNS, certificate transparency, or header-checker tools individually. Especially useful for security audits, vendor due diligence, pre-launch checks, or certificate expiry monitoring workflows.

## Known failure modes

- Domain does not exist or cannot be resolved — DNS lookup failure returned
- Domain is unreachable or times out — TLS handshake or HTTP request fails
- Invalid or malformed domain input — parameter validation error
- Domain resolves but serves no HTTPS — TLS certificate data unavailable
- Rate limiting or payment failure via x402 — HTTP 402 returned

## 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://preflight.agentdiet.dev/v1/domain-osint)

## Output

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

## 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/preflight-agentdiet-dev-domain-osint-tls-certificate-security-headers-fa82a7d0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from preflight.agentdiet.dev](https://www.zero.xyz/host/preflight.agentdiet.dev/llms.txt)