# Domain OSINT, TLS Certificate & Security Headers Recon

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

Inspects a domain's live DNS resolution (IPv4/IPv6), TLS certificate issuer and expiry, and HTTP security headers grade.

## Facts

- Endpoint: GET https://domain-osint.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: domain-osint.agentdiet.dev
- Website: https://domain-osint.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/domain-osint-agentdiet-dev-domain-osint-tls-certificate-security-a7ad89da
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zYqE8-aZWwsjJavjZIwOT

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 domain-osint-agentdiet-dev-domain-osint-tls-certificate-security-a7ad89da
```

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

## When to prefer this

Choose this endpoint when you need a quick, unified OSINT snapshot of a domain's DNS configuration, TLS certificate health, and HTTP security posture in a single call, especially for security audits, pre-acquisition due diligence, or automated monitoring of certificate expiry and header compliance.

## Known failure modes

- Invalid or non-existent domain name returns an error or empty DNS results
- Domain with no TLS certificate may return missing certificate fields
- Unreachable domain may cause timeout or connection error
- Malformed domain string (e.g. missing TLD) returns validation error
- Domains blocking probe traffic may return incomplete security header data

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

## Output

Returns live DNS resolution results (IPv4 and IPv6 addresses), TLS certificate metadata including issuer and expiry date, and an HTTP security headers grade for the target domain, enabling rapid security posture assessment.

## 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/domain-osint-agentdiet-dev-domain-osint-tls-certificate-security-a7ad89da/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from domain-osint.agentdiet.dev](https://www.zero.xyz/host/domain-osint.agentdiet.dev/llms.txt)