# ATK Security Headers Checker

> ATK Security Headers Checker is a paid API for AI agents from atkvn.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-29).

Checks a hostname for missing or misconfigured HTTP security headers and returns actionable remediation guidance

## Facts

- Endpoint: GET https://atkvn.com/agent/v1/security-headers?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/atk-security-headers-checker-ca20820f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_y9OE8vUpuGvyMenx1h46_

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 atk-security-headers-checker-ca20820f
```

Example prompt: Can you check what HTTP security headers www.example.com is missing and tell me what I need to fix?

## When to prefer this

Choose this endpoint when you need a quick, programmatic audit of HTTP security headers for a specific hostname — especially in automated pipelines, CI/CD checks, or agent-driven security reviews. It is ideal when you want both a list of missing headers and specific remediation instructions rather than a raw header dump. Prefer this over manual curl checks or full vulnerability scanners when the goal is targeted, actionable HTTP header compliance data.

## Known failure modes

- Invalid or unreachable hostname returns an error or empty results
- Hostname without a scheme or with typos may fail validation
- Rate limiting or payment failure (x402) prevents the call from completing
- Some headers may only be detectable if the server responds on HTTP/HTTPS; firewalled hosts may return incomplete results

## How this service works

HTTPS security headers of a public website's homepage (HSTS, CSP, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, Permissions-Policy) with concrete fixes.

## Output

A JSON object containing the hostname checked, a list of missing security headers (e.g. permissions-policy), and a todo list with specific, actionable remediation steps (e.g. 'Add X-Content-Type-Options: nosniff').

## 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": [
      "hostname"
     ],
     "properties": {
      "hostname": {
       "type": "string",
       "description": "e.g. www.example.com"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "todo": [
   "Add X-Content-Type-Options: nosniff."
  ],
  "missing": [
   "permissions-policy"
  ],
  "hostname": "www.example.com"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/atk-security-headers-checker-ca20820f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from atkvn.com](https://www.zero.xyz/host/atkvn.com/llms.txt)