# Domain OSINT, TLS Certificate & Security Headers Recon

> Domain OSINT, TLS Certificate & Security Headers Recon is a paid API for AI agents from hn-pulse.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-21).

Performs live reconnaissance on a domain including IPv4/IPv6 DNS resolution, TLS certificate issuer and expiry, and HTTP security header grading.

## Facts

- Endpoint: GET https://hn-pulse.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: hn-pulse.agentdiet.dev
- Website: https://hn-pulse.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/hn-pulse-agentdiet-dev-domain-osint-tls-certificate-security-headers-605d40f9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_CSTmwiDfXYaglj-WeoktH

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 hn-pulse-agentdiet-dev-domain-osint-tls-certificate-security-headers-605d40f9
```

Example prompt: Can you do a full OSINT recon on anthropic.com — I want to see its DNS resolution (IPv4 and IPv6), TLS certificate issuer and expiry date, and how it scores on HTTP security headers?

## When to prefer this

Choose this endpoint when you need live, real-time OSINT data on a domain's DNS resolution, TLS certificate status, and HTTP security posture in a single call. Prefer it over manual lookup tools or passive WHOIS-only services when you need current certificate expiry, issuer chain, and active security header grades together.

## Known failure modes

- Domain does not exist or fails DNS resolution — returns empty or error response
- Domain is unreachable or times out during live probe — may return partial data or error
- Invalid domain format provided — validation error returned
- TLS certificate absent or unreachable HTTPS endpoint — certificate fields may be null
- Rate limiting or payment failure — HTTP 402 or 429 response

## 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://hn-pulse.agentdiet.dev/v1/asn-lookup)

## Output

Returns live DNS resolution results (IPv4 and IPv6 addresses), TLS certificate metadata (issuer, expiry date), and an HTTP security header grade or breakdown for the specified 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/hn-pulse-agentdiet-dev-domain-osint-tls-certificate-security-headers-605d40f9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from hn-pulse.agentdiet.dev](https://www.zero.xyz/host/hn-pulse.agentdiet.dev/llms.txt)