# Domain OSINT, TLS Certificate & Security Headers Recon

> Domain OSINT, TLS Certificate & Security Headers Recon is a paid API for AI agents from sec-intel.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, and HTTP security header grading for a given domain name.

## Facts

- Endpoint: GET https://sec-intel.agentdiet.dev/v1/dns-recon?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: sec-intel.agentdiet.dev
- Website: https://sec-intel.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/sec-intel-agentdiet-dev-domain-osint-tls-certificate-security-headers-3b97f752
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Yw7dwHVlLBkdmMzc5LlOE

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 sec-intel-agentdiet-dev-domain-osint-tls-certificate-security-headers-3b97f752
```

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

## When to prefer this

Choose this endpoint when you need live, real-time reconnaissance on a domain's DNS resolution, TLS certificate validity, and HTTP security configuration in a single call. It is ideal for security audits, vendor due diligence, certificate expiry monitoring, or OSINT investigations where you want a combined DNS + TLS + security headers snapshot without chaining multiple separate lookups.

## Known failure modes

- Domain does not resolve — DNS lookup returns no records, empty or error response
- Domain is unreachable over HTTPS — TLS handshake fails, certificate data unavailable
- Invalid domain format provided — missing or malformed domain string returns validation error
- Domain uses HTTP only — no TLS certificate data available
- Timeout on live probe — domain responds too slowly, partial results 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://sec-intel.agentdiet.dev/v1/dns-recon)

## Output

Returns live DNS resolution results (IPv4 and IPv6 addresses), TLS certificate metadata (issuer, expiry date, validity), and an HTTP security header assessment including presence and grade of headers like HSTS, CSP, X-Frame-Options, and an overall security grade for the 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/sec-intel-agentdiet-dev-domain-osint-tls-certificate-security-headers-3b97f752/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from sec-intel.agentdiet.dev](https://www.zero.xyz/host/sec-intel.agentdiet.dev/llms.txt)