# Domain OSINT, TLS Certificate & Security Headers Recon

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

Performs live DNS resolution, TLS certificate inspection, and HTTP security header grading for any given domain.

## Facts

- Endpoint: GET https://mcp-security.agentdiet.dev/v1/domain-osint?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: mcp-security.agentdiet.dev
- Website: https://mcp-security.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/mcp-security-agentdiet-dev-domain-osint-tls-certificate-security-0096b7db
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_qdy5708lNUgywCgd9CkxJ

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 mcp-security-agentdiet-dev-domain-osint-tls-certificate-security-0096b7db
```

Example prompt: Can you run a full domain OSINT check on stripe.com — I want to see its DNS resolution, who issued its TLS certificate and when it expires, and what its HTTP security headers look like?

## When to prefer this

Use this endpoint when you need a fast, all-in-one passive recon snapshot of a domain's DNS posture, TLS certificate health, and HTTP security header configuration — especially for security audits, phishing domain triage, or pre-deployment checks. Prefer this over raw DNS lookup tools when you also need TLS cert and security header data in a single call.

## Known failure modes

- Domain does not exist or fails DNS resolution — no records returned
- Domain is unreachable or times out during TLS handshake
- Domain does not serve HTTPS, so TLS certificate data is unavailable
- Invalid or malformed domain name input causing validation error
- Rate limiting or payment failure (HTTP 402) preventing the call from completing

## 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://mcp-security.agentdiet.dev/v1/domain-osint)

## Output

Returns a structured object containing live IPv4/IPv6 DNS resolution results, TLS certificate details (issuer, validity dates, expiry), and an HTTP security headers analysis including presence and grading of headers such as HSTS, CSP, X-Frame-Options, and others.

## 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/mcp-security-agentdiet-dev-domain-osint-tls-certificate-security-0096b7db/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mcp-security.agentdiet.dev](https://www.zero.xyz/host/mcp-security.agentdiet.dev/llms.txt)