# 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 DNS resolution (IPv4/IPv6), TLS certificate inspection (issuer, expiry), and HTTP security header grading for a given domain.

## Facts

- Endpoint: GET https://hn-pulse.agentdiet.dev/v1/cert-transparency?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-5cd58761
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_AsL2LhwvKD8zTBpuivhG1

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-5cd58761
```

Example prompt: Can you check the TLS certificate issuer, expiry date, DNS resolution, and HTTP security header grade for anthropic.com?

## When to prefer this

Use this endpoint when you need a live, combined snapshot of DNS records, TLS certificate details, and HTTP security headers for a domain in a single call — especially useful for OSINT investigations, pre-launch security audits, or monitoring certificate expiry without setting up separate tooling.

## Known failure modes

- Domain does not exist or fails DNS resolution — may return empty or error response
- Domain is unreachable or times out during live probe — timeout or connection error
- Invalid domain format provided — validation error on the 'domain' parameter
- Domain uses non-standard ports or blocks automated probes — incomplete TLS/header data
- Payment not made (HTTP 402) — request blocked until $0.01 USDC paid

## 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/cert-transparency)

## Output

Returns live IPv4 and IPv6 DNS resolution results, TLS certificate metadata (issuer, subject, expiry date), and an HTTP security header grade/assessment for the queried 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-5cd58761/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)