Mekler AI Security Header & CORS Policy Checker

x402

Mekler AI Security Header & CORS Policy Checker is a paid API for AI agents from api.mekler.ai, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-29).

Passively inspects a public URL's HTTP security headers and cross-origin (CORS) configuration by issuing a GET and a credential-free OPTIONS preflight, returning observed headers and severity-tagged findings.

Price / call$0.005

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StatusUnknown

How this service works

Inspect one public URL for observed security headers and cross-origin configuration. Send passive GET and credential-free OPTIONS with a supplied origin, requested method and optional header names; return exact selected headers and evidence-linked findings. No authorization/cookies, exploit attempts, state-changing requests, browser enforcement guarantee or full CSP/TLS analysis.

Output

A JSON object containing the target URL, origin used, HTTP status, observed response headers (as key-value pairs), a preflight object with CORS headers and status, an array of severity-tagged findings (each with a code, evidence string, severity level, and recommendation), the requested method, observed timestamp, and a limitations disclaimer list.

Example use cases

Pre-deployment security header audit

“Before I launch my site at https://mystore.com, can you check what security headers it's sending and flag anything important that's missing, like HSTS or CSP?”

CORS compatibility check for frontend integration

“I'm building a frontend at https://app.mycompany.com that needs to call https://api.thirdparty.com — can you check whether that API allows cross-origin GET requests from my domain and what headers it returns?”

Incident triage for unexpected CORS errors

“My team is getting CORS errors when our app at https://dashboard.internal.com tries to send DELETE requests to https://api.partner.io — can you inspect that URL's CORS configuration using our origin and the DELETE method to see what's actually allowed?”

Technical details

Endpoint

POSThttps://api.mekler.ai/v1/web/headers/check-security-policy?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need a quick, passive, read-only snapshot of what HTTP security headers and CORS configuration a public URL actually serves — without needing a full vulnerability scanner, browser simulation, or TLS certificate analysis. It is ideal for pre-deployment checks, integration compatibility validation (e.g. confirming a third-party API allows your origin), and lightweight security audits where you only need observed header evidence and actionable findings rather than deep CSP syntax parsing or authenticated session analysis.

Side effects

URL is not publicly reachable — returns error status with no headers observed
URL requires authentication or returns non-2xx without credentials — findings reflect unauthenticated state only
CORS policy varies by route or authentication state — observed results may not reflect authenticated behavior
Invalid URL format or URL exceeding 2048 characters — validation error returned
Origin string malformed or too long — validation error
Requested method not in allowed enum — validation error
Server does not respond to OPTIONS — preflight section may be absent or show error status
Rate limiting or upstream timeouts — transient errors possible

Input

Schema · Request body

Field	Type	Description
url	string
origin	string
request_id	string
request_headers	array
requested_method	string

Output

Schema · Response

{
  "type": "json",
  "example": {
    "url": "https://mekler.ai/",
    "origin": "https://mekler.ai",
    "status": "ok",
    "findings": [
      {
        "code": "hsts_absent",
        "evidence": "No HSTS response header.",
        "severity": "info",
        "recommendation": "Consider HSTS after confirming HTTPS coverage for the intended host scope."
      },
      {
        "code": "csp_absent",
        "evidence": "No enforced CSP response header.",
        "severity": "info",
        "recommendation": "Consider a tested CSP appropriate to the application; report-only is not enforcement."
      }
    ],
    "preflight": {
      "url": "https://mekler.ai/",
      "headers": {
        "x-content-type-options": "nosniff",
        "access-control-allow-origin": "*",
        "access-control-allow-methods": "GET, HEAD"
      },
      "http_status": 200
    },
    "http_status": 200,
    "limitations": [
      "Passive GET and credential-free OPTIONS observations only; no cookies, authorization, exploit attempts or state-changing method is sent.",
      "Observed policies may vary by route, origin, browser and authentication. This is not a vulnerability scan or a browser enforcement/safety certification.",
      "CSP syntax/effective-policy analysis and TLS certificate inspection are outside this operation."
    ],
    "observed_at": "2026-10-20T00:00:00Z",
    "request_headers": [],
    "requested_method": "GET",
    "response_headers": {
      "x-content-type-options": "nosniff",
      "access-control-allow-origin": "*",
      "access-control-allow-methods": "GET, HEAD"
    }
  }
}

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