# Domain OSINT, TLS Certificate & Security Headers Recon

> Domain OSINT, TLS Certificate & Security Headers Recon is a paid API for AI agents from serp-extract.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-23).

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

## Facts

- Endpoint: POST https://serp-extract.agentdiet.dev/v1/subdomain-scan?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Provider: serp-extract.agentdiet.dev
- Website: https://serp-extract.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/serp-extract-agentdiet-dev-domain-osint-tls-certificate-security-ecb0723d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_lX8uiVEy55eK0HXKLC49F

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 serp-extract-agentdiet-dev-domain-osint-tls-certificate-security-ecb0723d -d '<json body>'
```

Example prompt: Can you run a full domain OSINT scan on stripe.com — I want to see its live DNS records (IPv4 and IPv6), TLS certificate issuer and expiry date, and how well its HTTP security headers score?

## When to prefer this

Choose this endpoint when you need a fast, single-call OSINT snapshot of a domain's DNS, TLS, and HTTP security posture — ideal for threat intelligence pipelines, pre-acquisition due diligence, certificate expiry monitoring, or competitive recon. Prefer this over manual tooling (dig, nmap, ssllabs) when you need a programmatic, agent-friendly result in one request.

## Known failure modes

- Domain does not exist or fails DNS resolution — no records returned
- TLS certificate absent or unreachable (HTTP-only site) — cert fields empty or error
- Domain is rate-limited or blocked from external probes — timeout or connection refused
- Invalid domain string input — validation error returned
- Network unreachable or upstream DNS failure — service error response

## 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://serp-extract.agentdiet.dev/v1/subdomain-scan)

## Output

Returns live DNS resolution data (IPv4 and IPv6 addresses), TLS certificate metadata (issuer, expiry date, validity status), and an HTTP security header assessment/grade for the target domain, enabling security posture evaluation and domain intelligence gathering.

## 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/serp-extract-agentdiet-dev-domain-osint-tls-certificate-security-ecb0723d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from serp-extract.agentdiet.dev](https://www.zero.xyz/host/serp-extract.agentdiet.dev/llms.txt)