# 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 (IPv4/IPv6), TLS certificate inspection (issuer, expiry), and HTTP security header grading for a target domain.

## Facts

- Endpoint: GET https://mcp-security.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: 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-781fd47a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PwYPreEYyFeiiAKnZ0APA

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-781fd47a
```

Example prompt: Can you run a full domain OSINT check on stripe.com — I want to see its DNS resolution (IPv4 and IPv6), TLS certificate issuer and expiry, and its HTTP security header grade?

## When to prefer this

Choose this endpoint when you need a fast, combined OSINT snapshot of a domain's DNS resolution, TLS certificate validity, and HTTP security headers in a single call. It is ideal for security due diligence, pre-deployment checks, vendor recon, or certificate expiry monitoring. Prefer it over manual DNS/TLS tools when you need structured, agent-consumable output with a security grade already computed.

## Known failure modes

- Domain does not exist or fails DNS resolution — returns error or empty DNS fields
- Domain has no HTTPS/TLS — certificate fields may be null or absent
- Payment not provided — HTTP 402 returned requiring x402 USDC payment
- Invalid domain string — validation error with bad input
- Timeout if target domain is unresponsive — partial or empty response
- Domain is IPv4-only or IPv6-only — one address family may be absent

## 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/osint)

## Output

Returns live DNS resolution results (IPv4 and IPv6 addresses), TLS certificate details (issuer, expiry date), and an HTTP security header grade for the queried domain, allowing agents to assess the domain's infrastructure and 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/mcp-security-agentdiet-dev-domain-osint-tls-certificate-security-781fd47a/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)