# Domain OSINT, TLS Certificate & Security Headers Recon

> Domain OSINT, TLS Certificate & Security Headers Recon is a paid API for AI agents from x402-audit.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://x402-audit.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: x402-audit.agentdiet.dev
- Website: https://x402-audit.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/x402-audit-agentdiet-dev-domain-osint-tls-certificate-security-97fd2364
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_MsF3yMr2-69MbeeEeKHyk

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 x402-audit-agentdiet-dev-domain-osint-tls-certificate-security-97fd2364
```

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

## When to prefer this

Choose this endpoint when you need a fast, live, all-in-one domain reconnaissance covering DNS (IPv4/IPv6), TLS certificate details, and HTTP security headers in a single call. Prefer it over manual tooling or separate DNS/TLS APIs when you want a consolidated OSINT snapshot of a domain's network and certificate posture without stitching multiple services together.

## Known failure modes

- Domain does not exist or fails DNS resolution — returns empty or error result
- Domain is unreachable or times out during TLS handshake
- Domain has no HTTPS endpoint, so TLS inspection returns no certificate data
- Invalid domain format provided in query parameter
- Transient network errors during live probe cause incomplete results

## 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://x402-audit.agentdiet.dev/v1/cert-transparency)

## Output

Returns live DNS resolution results (IPv4 and IPv6 addresses), TLS certificate metadata (issuer, expiry date, validity status), and an HTTP security header grade reflecting the domain's security posture.

## 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/x402-audit-agentdiet-dev-domain-osint-tls-certificate-security-97fd2364/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-audit.agentdiet.dev](https://www.zero.xyz/host/x402-audit.agentdiet.dev/llms.txt)