# Domain OSINT, TLS Certificate & Security Headers Recon

> Domain OSINT, TLS Certificate & Security Headers Recon is a paid API for AI agents from defi-yield.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 given domain name.

## Facts

- Endpoint: GET https://defi-yield.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: defi-yield.agentdiet.dev
- Website: https://defi-yield.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/defi-yield-agentdiet-dev-domain-osint-tls-certificate-security-a017b45d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_mv3bYo70zWnwhWPSwag4l

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 defi-yield-agentdiet-dev-domain-osint-tls-certificate-security-a017b45d
```

Example prompt: Can you run a full domain OSINT check on anthropic.com — I want to see its DNS records (both IPv4 and IPv6), TLS certificate issuer and expiry date, and how it scores on HTTP security headers?

## When to prefer this

Choose this endpoint when you need a single-call OSINT snapshot of a domain's DNS resolution, TLS certificate status, and HTTP security posture without setting up your own scanning infrastructure. It is particularly useful for security due diligence on vendors or competitors, certificate expiry monitoring, and quick reconnaissance during threat investigations. Prefer this over generic WHOIS services when TLS and security header data are also required alongside DNS resolution.

## Known failure modes

- Domain does not exist or has no DNS records — returns empty or error response
- TLS certificate is absent or self-signed — may return partial data or an error flag
- Domain is unreachable during live probe — may result in timeout or connection error
- Invalid domain format supplied — returns validation error
- HTTP security headers unavailable if domain does not serve HTTP/HTTPS — returns partial result

## 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://defi-yield.agentdiet.dev/v1/whois-lookup)

## Output

Returns live DNS resolution results (IPv4 and IPv6 addresses), TLS certificate metadata (issuer name, validity dates, expiry), and an HTTP security headers assessment including a security grade for the queried domain.

## 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/defi-yield-agentdiet-dev-domain-osint-tls-certificate-security-a017b45d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from defi-yield.agentdiet.dev](https://www.zero.xyz/host/defi-yield.agentdiet.dev/llms.txt)