# 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 OSINT on a domain by inspecting its IPv4/IPv6 DNS resolution, TLS certificate issuer and expiry, and HTTP security header grade

## Facts

- Endpoint: GET https://preflight.agentdiet.dev/v1/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-d0257f25
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_lw_RUGDrTc-JfIJSlkJgH

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-d0257f25
```

Example prompt: Can you run a full security recon on anthropic.com — check its DNS resolution for both IPv4 and IPv6, look up the TLS certificate issuer and expiry date, and tell me its HTTP security header grade?

## When to prefer this

Choose this endpoint when you need a fast, single-call OSINT snapshot of a domain's DNS, TLS, and HTTP security posture without building multiple separate DNS, certificate, and header-check integrations. It's ideal for security due diligence workflows, pre-integration vendor checks, certificate expiry monitoring, and competitive infrastructure reconnaissance. Prefer it over manual curl/dig commands or multiple specialized APIs when you want consolidated domain intelligence in one response.

## Known failure modes

- Domain does not exist or fails DNS resolution — returns an error or empty DNS records
- Domain has no TLS certificate — certificate fields will be null or missing
- Domain is unreachable or times out — network error response
- Invalid or malformed domain input — validation error with descriptive message
- Domain blocks automated HTTP probes — security headers 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://preflight.agentdiet.dev/v1/osint)

## Output

Returns live DNS resolution results (IPv4 and IPv6 addresses), TLS certificate metadata including issuer and expiration date, and an HTTP security header grade reflecting the presence or absence of security 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/preflight-agentdiet-dev-domain-osint-tls-certificate-security-headers-d0257f25/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)