# 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 reconnaissance on a domain including IPv4/IPv6 DNS resolution, TLS certificate issuer and expiry details, and HTTP security header grading.

## Facts

- Endpoint: GET https://x402-audit.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: 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-de309ebe
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_TqUMXksnPt-ysAGH06U-A

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-de309ebe
```

Example prompt: Can you run a full OSINT check on anthropic.com — I want to see the DNS resolution, TLS certificate issuer and expiry date, and how it grades on HTTP security headers?

## When to prefer this

Use this endpoint when you need a quick, live reconnaissance snapshot of a domain's DNS posture, TLS certificate health, and HTTP security header configuration without running a full vulnerability scan. It is ideal for passive security assessments, vendor due diligence, certificate expiry monitoring, and domain OSINT investigations where you need structured, machine-readable results at low cost ($0.01/call).

## Known failure modes

- Domain does not exist or fails DNS resolution — returns error indicating unresolvable domain
- Domain has no TLS certificate (HTTP-only) — TLS fields may be null or absent
- Network timeout reaching the target domain — may return partial results or timeout error
- Invalid domain format supplied — returns validation error
- Domain is reachable but blocks external probes — security headers may be incomplete

## 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/osint)

## Output

Returns live DNS resolution data (IPv4 and IPv6 addresses), TLS certificate details including issuer and expiry date, and an HTTP security header grade reflecting the presence or absence of headers like HSTS, CSP, X-Frame-Options, and similar security controls.

## 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-de309ebe/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)