# SignalDesk AI – Security Headers Checker

> SignalDesk AI – Security Headers Checker is a paid API for AI agents from x402-agent.kariguetoazul.workers.dev, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-13).

Fetches the HTTP response headers of a given public HTTPS URL and identifies which security headers are present or missing

## Facts

- Endpoint: GET https://x402-agent.kariguetoazul.workers.dev/api/security/headers?utm_source=zero.xyz
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signaldesk-ai-security-headers-checker-d90c1918
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dZ9_QpoXtAPiD7mNhAnuT

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 signaldesk-ai-security-headers-checker-d90c1918
```

Example prompt: Can you check what security headers https://example.com/ has and tell me which important ones like Content-Security-Policy or Strict-Transport-Security are missing?

## When to prefer this

Use this endpoint when you need a fast, lightweight check of which HTTP security headers a public HTTPS URL exposes, without setting up a full browser-based security scanner. It is ideal for automated security audits, pre-deployment checklists, or verifying third-party sites. Prefer this over a full penetration testing tool when you only need header-level reconnaissance.

## Known failure modes

- Non-HTTPS or invalid URL returns a validation error — URL must be a public HTTPS address 8-2000 characters
- Target URL is unreachable or times out — upstream fetch failure with no headers returned
- Private or localhost URLs rejected by the service
- Payment not completed — x402 payment required before endpoint responds
- URL returns non-standard status codes that may cause partial or empty header data

## How this service works

Evidence-backed autonomous AI jobs and paid data tools. Queue/D1/cron run outside the chat; free quotas and bounded execution apply.

## Output

Returns a JSON object containing the target URL, HTTP status code, a dictionary of all response headers received, a list of missing recommended security headers (e.g. strict-transport-security, content-security-policy, x-content-type-options, x-frame-options, referrer-policy, permissions-policy), a warning that header presence alone does not establish security, and a timestamp of when the fetch occurred.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "url"
     ],
     "properties": {
      "url": {
       "type": "string",
       "maxLength": 2000,
       "minLength": 8,
       "description": "Public HTTPS URL."
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "url": "https://example.com/",
  "http": 200,
  "headers": {
   "server": "cloudflare",
   "content-type": "text/html; charset=utf-8"
  },
  "missing": [
   "strict-transport-security",
   "content-security-policy",
   "x-content-type-options",
   "x-frame-options",
   "referrer-policy",
   "permissions-policy"
  ],
  "warning": "Header presence alone does not establish security.",
  "fetched_at": "2026-10-02T09:44:48.181Z"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/signaldesk-ai-security-headers-checker-d90c1918/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-agent.kariguetoazul.workers.dev](https://www.zero.xyz/host/x402-agent.kariguetoazul.workers.dev/llms.txt)