# Domain OSINT, TLS Certificate & Security Headers Recon

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

Performs live DNS resolution, TLS certificate inspection, and HTTP security header grading for any domain.

## Facts

- Endpoint: GET https://preflight.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: preflight.agentdiet.dev
- Website: https://preflight.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/preflight-agentdiet-dev-domain-osint-tls-certificate-security-headers-bc540514
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5Cc9IOU1RJA0TnhlzuPzp

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 preflight-agentdiet-dev-domain-osint-tls-certificate-security-headers-bc540514
```

Example prompt: Can you do a full TLS and security header recon on stripe.com — I want to see its DNS resolution, certificate issuer and expiry date, and overall HTTP security grade?

## When to prefer this

Choose this endpoint when you need a combined, single-call OSINT snapshot of a domain's DNS posture, TLS certificate health, and HTTP security configuration — rather than querying separate tools for DNS lookup, SSL checking, and header analysis. Ideal for security recon, pre-deployment audits, vendor risk assessment, or threat intelligence workflows.

## Known failure modes

- Domain does not exist or fails DNS resolution — returns error or empty DNS fields
- Domain has no HTTPS/TLS — certificate fields may be absent or null
- Target domain blocks or rate-limits the scanner — may return incomplete results
- Invalid domain format supplied — returns validation error
- Timeout if the target host is slow to respond

## 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://preflight.agentdiet.dev/v1/tls-scanner)

## Output

Returns live IPv4 and IPv6 DNS resolution results, TLS certificate details including issuer and expiry date, and an HTTP security grade based on the presence and correctness of security headers such as HSTS, CSP, and X-Frame-Options.

## 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/preflight-agentdiet-dev-domain-osint-tls-certificate-security-headers-bc540514/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from preflight.agentdiet.dev](https://www.zero.xyz/host/preflight.agentdiet.dev/llms.txt)