# Domain OSINT, TLS Certificate & Security Headers Recon

> Domain OSINT, TLS Certificate & Security Headers Recon is a paid API for AI agents from email-verify.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://email-verify.agentdiet.dev/v1/cert-transparency?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: email-verify.agentdiet.dev
- Website: https://email-verify.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/email-verify-agentdiet-dev-domain-osint-tls-certificate-security-ac1743f5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_iHB___jrzwOQDav-5pAI4

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 email-verify-agentdiet-dev-domain-osint-tls-certificate-security-ac1743f5
```

Example prompt: Can you pull up the DNS resolution, TLS certificate details, and HTTP security header grade for anthropic.com?

## When to prefer this

Choose this endpoint when you need a quick, all-in-one OSINT snapshot of a domain covering DNS, TLS certificate, and HTTP security posture in a single call. It is ideal for security audits, vendor due diligence, certificate expiry monitoring, and competitive recon — especially when you need live data rather than cached records. Prefer it over raw DNS tools when you also need TLS and security header context in one response.

## Known failure modes

- Domain does not exist or fails DNS resolution — returns error or empty DNS records
- Domain has no HTTPS/TLS — TLS certificate fields may be absent or null
- Firewall or rate-limiting blocks live HTTP probe — security headers may be unavailable
- Invalid domain format supplied — returns validation error
- Domain resolves but HTTP server is down — partial results with DNS only

## 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://email-verify.agentdiet.dev/v1/cert-transparency)

## Output

Returns live DNS resolution data (IPv4/IPv6 addresses), TLS certificate details (issuer, validity period, expiry date), and an HTTP security grade based on presence and configuration of security headers such as HSTS, CSP, X-Frame-Options, and similar directives.

## 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/email-verify-agentdiet-dev-domain-osint-tls-certificate-security-ac1743f5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from email-verify.agentdiet.dev](https://www.zero.xyz/host/email-verify.agentdiet.dev/llms.txt)