# Domain OSINT, TLS Certificate & Security Headers Recon

> Domain OSINT, TLS Certificate & Security Headers Recon is a paid API for AI agents from sec-intel.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://sec-intel.agentdiet.dev/v1/asn-lookup?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: sec-intel.agentdiet.dev
- Website: https://sec-intel.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/sec-intel-agentdiet-dev-domain-osint-tls-certificate-security-headers-c92416ed
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_g3s-0MvlKtvHM3XVfxUH3

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 sec-intel-agentdiet-dev-domain-osint-tls-certificate-security-headers-c92416ed
```

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

## When to prefer this

Choose this endpoint when you need live, real-time OSINT on a domain's DNS configuration, TLS certificate validity, and HTTP security posture in a single call. It is ideal for security audits, vendor due diligence, certificate expiry monitoring, or reconnaissance workflows where a current snapshot of a domain's security infrastructure is required — without needing to manually query DNS tools, certificate transparency logs, and security header checkers separately.

## Known failure modes

- Domain does not exist or fails DNS resolution — returns error or empty DNS fields
- Domain has no TLS certificate (HTTP-only) — TLS fields may be null or absent
- Domain is unreachable or times out during live probe — returns timeout or connection error
- Invalid or malformed domain input — returns validation error
- Rate limiting or payment failure (x402) — returns 402 Payment Required

## 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://sec-intel.agentdiet.dev/v1/asn-lookup)

## Output

Returns live DNS resolution data (IPv4/IPv6 addresses), TLS certificate details (issuer, expiry date), and an HTTP security header grade/analysis for the queried domain, packaged as a structured JSON object.

## 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/sec-intel-agentdiet-dev-domain-osint-tls-certificate-security-headers-c92416ed/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from sec-intel.agentdiet.dev](https://www.zero.xyz/host/sec-intel.agentdiet.dev/llms.txt)