# Domain OSINT, TLS Certificate & Security Headers Recon

> Domain OSINT, TLS Certificate & Security Headers Recon is a paid API for AI agents from 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 headers grading for a given domain.

## Facts

- Endpoint: GET https://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: agentdiet.dev
- Website: https://agentdiet.dev
- Canonical page: https://www.zero.xyz/c/agentdiet-dev-domain-osint-tls-certificate-security-headers-recon-84565a67
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_oB3SkrkCer702wYj0nS_G

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 agentdiet-dev-domain-osint-tls-certificate-security-headers-recon-84565a67
```

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

## When to prefer this

Use this endpoint when you need live, real-time DNS, TLS, and HTTP security header intelligence for a single domain — ideal for security audits, vendor due diligence, pre-launch checks, or quick OSINT recon. Prefer this over static WHOIS-only tools when you need actual TLS cert issuer/expiry and security headers grading from a live HTTP probe.

## Known failure modes

- Domain does not exist or cannot be resolved — DNS lookup fails with an error
- Domain has no TLS certificate (HTTP-only) — TLS fields may be null or missing
- Network timeout during live probing — endpoint may return an error or partial data
- Invalid domain input (empty string or malformed) — returns validation error
- Domain is reachable but blocks external probes — 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://agentdiet.dev/v1/osint)

## Output

Returns live DNS resolution results (IPv4 and IPv6 addresses), TLS certificate metadata (issuer, expiry date), and an HTTP security headers grade reflecting the presence or absence of headers like HSTS, CSP, X-Frame-Options, etc.

## 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/agentdiet-dev-domain-osint-tls-certificate-security-headers-recon-84565a67/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentdiet.dev](https://www.zero.xyz/host/agentdiet.dev/llms.txt)