# 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, and HTTP security header grading for any target domain.

## 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-4954f298
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ovGMbbA0UXsU2nshks8sK

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-4954f298
```

Example prompt: Can you run a full domain OSINT check on stripe.com — I want to see its IPv4/IPv6 DNS resolution, who issued its TLS certificate, when it expires, and its HTTP security headers grade?

## When to prefer this

Choose this endpoint when you need a fast, passive OSINT snapshot of a domain's DNS, TLS, and HTTP security posture without active exploitation. Ideal for pre-integration vendor security checks, certificate expiry monitoring, or competitive benchmarking. Prefer over manual nslookup/openssl tooling when automating agent-driven security workflows.

## Known failure modes

- Invalid or non-existent domain name — returns error or empty resolution
- Domain with no HTTPS endpoint — TLS certificate fields may be absent
- DNS resolution timeout — network unreachability may cause partial results
- Domain behind CDN or WAF — resolved IPs may reflect CDN infrastructure rather than origin
- Rate limiting or payment failure — HTTP 402 if payment not provided

## 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 (issuer, expiry date), and an HTTP security headers grade for the target domain, enabling rapid security posture assessment without active penetration testing.

## 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-4954f298/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)