# Domain OSINT, TLS Certificate & Security Headers Recon

> Domain OSINT, TLS Certificate & Security Headers Recon is a paid API for AI agents from polymarket-odds.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-21).

Performs live reconnaissance on a domain including IPv4/IPv6 DNS resolution, TLS certificate issuer and expiry, and HTTP security header grading.

## Facts

- Endpoint: GET https://polymarket-odds.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: polymarket-odds.agentdiet.dev
- Website: https://polymarket-odds.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/polymarket-odds-agentdiet-dev-domain-osint-tls-certificate-security-c5624097
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_uFD_xCOltK_HootYIsF5-

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 polymarket-odds-agentdiet-dev-domain-osint-tls-certificate-security-c5624097
```

Example prompt: Can you run a security recon on anthropic.com — I want to see its DNS resolution, TLS certificate issuer and expiry date, and how its HTTP security headers are graded?

## When to prefer this

Choose this endpoint when you need a fast, all-in-one passive recon snapshot of a domain's DNS infrastructure, TLS certificate chain, and HTTP security header posture — without sending intrusive probes. Ideal for security assessments, vendor vetting, competitive intelligence, or pre-launch audits where you want certificate issuer, expiry, and security grade in a single call.

## Known failure modes

- Domain does not exist or fails DNS resolution — returns error or empty DNS result
- Domain has no TLS certificate (HTTP-only) — TLS fields may be null or absent
- Domain is unreachable/firewalled — timeout or connection error
- Invalid or malformed domain input — validation error
- Rate limiting or payment failure — HTTP 402 response requiring x402 payment

## 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://polymarket-odds.agentdiet.dev/v1/whois-lookup)

## Output

Returns live DNS resolution data (IPv4 and IPv6 addresses), TLS certificate details including issuer and expiry date, and an HTTP security header 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/polymarket-odds-agentdiet-dev-domain-osint-tls-certificate-security-c5624097/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from polymarket-odds.agentdiet.dev](https://www.zero.xyz/host/polymarket-odds.agentdiet.dev/llms.txt)