# 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 any target domain.

## Facts

- Endpoint: GET https://x402-audit.agentdiet.dev/v1/dns-whois-tls-recon?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-0df9c75e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FFTjRINEbWRmC-dy2zZa0

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-0df9c75e
```

Example prompt: Can you run a full DNS, TLS certificate, and security headers recon on anthropic.com — I want to see the IPv4/IPv6 addresses it resolves to, who issued the SSL cert and when it expires, and whether the site has proper security headers?

## When to prefer this

Choose this endpoint when you need a quick, all-in-one passive recon snapshot of a domain's DNS posture, TLS certificate health, and HTTP security header configuration without running a full vulnerability scanner. It is ideal for security due diligence, OSINT reconnaissance, certificate expiry monitoring, and verifying web security hygiene on any publicly accessible domain.

## Known failure modes

- Domain does not exist or fails DNS resolution — returns DNS lookup error
- TLS handshake failure or no HTTPS on the domain — certificate data unavailable
- Rate limiting or network timeout reaching the target — request may time out
- Invalid or malformed domain string input — returns validation error
- Target domain blocks or rate-limits the probe — incomplete header data 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://x402-audit.agentdiet.dev/v1/dns-whois-tls-recon)

## Output

Returns live DNS resolution results including IPv4 and IPv6 addresses, TLS certificate metadata (issuer, subject, expiry dates, chain info), and an HTTP security header audit covering headers such as HSTS, CSP, X-Frame-Options, and an overall security grade for the target 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/x402-audit-agentdiet-dev-domain-osint-tls-certificate-security-0df9c75e/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)