# 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 headers grading for a given domain.

## Facts

- Endpoint: GET https://hn-pulse.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: 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-1eaae0e4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GHOmy3SmD_7TqBp52-kcy

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-1eaae0e4
```

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

## When to prefer this

Choose this endpoint when you need a quick, combined OSINT snapshot of a domain's DNS resolution, TLS certificate status, and HTTP security posture in a single API call, rather than running separate DNS, SSL checker, and header analysis tools. Especially useful for agent workflows that need to vet domains, monitor certificate health, or perform lightweight security reconnaissance without heavy vulnerability scanning infrastructure.

## Known failure modes

- Domain does not exist or cannot be resolved — DNS lookup failure
- TLS certificate unreachable or domain has no HTTPS — certificate data may be absent
- Rate limiting or payment failure (HTTP 402) if payment is not processed
- Network timeout if the target domain is slow to respond
- Invalid domain format provided — validation error returned

## 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/osint)

## Output

Returns live DNS resolution data (IPv4 and IPv6 addresses), TLS certificate metadata (issuer, expiry date), and an HTTP security headers grade/score for the queried domain, packaged as a 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/hn-pulse-agentdiet-dev-domain-osint-tls-certificate-security-headers-1eaae0e4/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)