# Domain OSINT, TLS Certificate & Security Headers Recon

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

Performs live DNS resolution, TLS certificate inspection, and HTTP security header analysis for any domain

## Facts

- Endpoint: GET https://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: agentdiet.dev
- Website: https://agentdiet.dev
- Canonical page: https://www.zero.xyz/c/agentdiet-dev-domain-osint-tls-certificate-security-headers-recon-6afe36c8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__nM6JcVqAq4_AjHsd92yk

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 agentdiet-dev-domain-osint-tls-certificate-security-headers-recon-6afe36c8
```

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

## When to prefer this

Choose this endpoint when you need a quick, live OSINT snapshot of a domain's DNS configuration, TLS certificate health, and HTTP security posture in a single call. It is ideal for security audits, vendor due diligence, competitive intelligence, or monitoring certificate expiry without needing to run separate DNS, SSL, and header tools.

## Known failure modes

- Domain does not exist or fails DNS resolution — no IP addresses returned
- Domain has no TLS certificate (HTTP-only) — certificate fields absent or error
- Domain is unreachable or firewalled — timeout or connection error
- Invalid domain format provided — validation error
- Domain resolves but returns no HTTP response for header analysis

## 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://agentdiet.dev/v1/cert-transparency)

## Output

Returns live DNS resolution results (IPv4 and/or IPv6 addresses), TLS certificate metadata including issuer name and expiry date, and an HTTP security header grade summarizing the presence and quality of headers like HSTS, CSP, X-Frame-Options, and others 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/agentdiet-dev-domain-osint-tls-certificate-security-headers-recon-6afe36c8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentdiet.dev](https://www.zero.xyz/host/agentdiet.dev/llms.txt)