# 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 2026-10-21).

Performs live DNS resolution (IPv4/IPv6), TLS certificate inspection (issuer, expiry), and HTTP security header grading for a given domain.

## Facts

- Endpoint: GET https://serp-extract.agentdiet.dev/v1/tls-scanner?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- 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-88b9ca66
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_yxvD5oiFGhV8xly4NXa1v

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-88b9ca66
```

Example prompt: Can you scan anthropic.com and tell me its DNS resolution addresses, who issued its TLS certificate, when it expires, and what HTTP security headers it has?

## When to prefer this

Choose this endpoint when you need a quick, unified OSINT snapshot of a domain's live DNS posture, TLS certificate health, and HTTP security header configuration in a single call. It is ideal for security reconnaissance, vendor due diligence, pre-launch audits, or continuous monitoring of certificate expiry. Prefer this over generic port scanners or manual certificate lookups when you need structured, agent-ready output combining DNS, TLS, and HTTP security signals together.

## Known failure modes

- Domain does not exist or fails DNS resolution — returns resolution failure or empty DNS records
- Domain has no TLS certificate (HTTP-only site) — TLS fields may be null or absent
- Network timeout reaching the target domain — returns timeout or connection error
- Invalid domain format provided — returns validation error
- Domain actively blocks scanning probes — may return incomplete or partial results

## 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/tls-scanner)

## Output

Returns live DNS resolution results (IPv4/IPv6 addresses), TLS certificate details (issuer, expiry date, validity status), and an HTTP security headers assessment including which security headers are present or missing and an overall security grade for the domain.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "domain"
 ],
 "properties": {
  "limit": {
   "type": "integer",
   "default": 20,
   "maximum": 100,
   "minimum": 1,
   "description": "Maximum number of items to return per page (1-100)"
  },
  "cursor": {
   "type": "string",
   "description": "Opaque pagination cursor for fetching the next page"
  },
  "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-88b9ca66/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)