# 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).

Inspects a domain's live DNS resolution (IPv4/IPv6), TLS certificate issuer and expiry, and HTTP security header grade for reconnaissance and risk assessment.

## Facts

- Endpoint: GET https://email-verify.agentdiet.dev/v1/whois-lookup?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-ee18a8d5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_IUiB7CEnL47OhVU64yTRD

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-ee18a8d5
```

Example prompt: Can you run a full DNS, TLS certificate, and HTTP security header recon on anthropic.com and tell me who issued the cert, when it expires, and what security grade the headers get?

## When to prefer this

Choose this endpoint when you need a combined DNS + TLS + security header snapshot of a domain in a single call, particularly for security due diligence, OSINT investigations, certificate expiry checks, or vendor risk assessments. Prefer this over raw WHOIS tools when you specifically need live resolution and TLS certificate metadata together rather than registrar ownership records.

## Known failure modes

- Domain does not exist or fails DNS resolution — returns an error or empty DNS fields
- Domain has no TLS certificate (HTTP-only) — TLS fields may be null or absent
- Domain is unreachable or times out — may return a timeout or partial result
- Invalid domain string format — returns a validation error
- Rate limiting or payment failure — returns HTTP 402 or 429

## 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/whois-lookup)

## Output

Returns live IPv4 and IPv6 DNS resolution results, TLS certificate metadata (issuer, expiry date, validity status), and an HTTP security header grade for the queried domain, enabling rapid security posture assessment and infrastructure reconnaissance.

## 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-ee18a8d5/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)