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HTTP Security Headers Grader
x402
HTTP Security Headers Grader is a paid API for AI agents from agent-data-tools.revmesh2074.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-20).
Fetches a public URL and grades its HTTP security headers (HSTS, CSP, framing, nosniff, Referrer-Policy, Permissions-Policy, version leaks, cookie flags), returning an A–F letter grade, numeric score, and per-check details.
Price / call$0.01
Success—
StatusUnknown
How this service works
Fetch a public URL and grade its HTTP security headers: HSTS, Content-Security-Policy, framing protection, nosniff, Referrer-Policy and Permissions-Policy, plus version leaks (Server, X-Powered-By) and cookies missing Secure, HttpOnly or SameSite. Returns a grade A-F, a score and each check with its value. Use to review a site's basic web security; for DNS and email records use domain. Private hosts are refused with 400, uncharged.
Output
Returns a JSON object with the final URL fetched, an A–F letter grade, a numeric score, and an array of individual checks — each with the header name, its value, a pass/warn/fail status, and an explanatory note. Private/internal hosts are rejected with HTTP 400 without charge.
Example use cases
Pre-launch security header review
“We're about to launch our new site at https://staging.myapp.io — can you check its HTTP security headers and tell me what grade it gets and what we need to fix before going live?”
Compliance audit for client site
“I need to audit https://www.clientbusiness.com for basic web security headers — HSTS, CSP, framing protection, cookie flags, the works. Give me the grade and a breakdown of every check.”
Detect server version information leaks
“Can you check if https://shop.mybrand.com is leaking any server or framework version info in its HTTP headers, and while you're at it, give me the full security header grade?”
Technical details
Endpoint
GEThttps://agent-data-tools.revmesh2074.workers.dev/http/security-headers?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, structured audit of a website's HTTP response security headers without setting up local tooling. It's ideal for pre-launch checklists, compliance reviews, or agent workflows that need a machine-readable security grade. For DNS records, MX/SPF/DKIM email security, or WHOIS data, use the companion /domain endpoint instead.
Side effects
- Private or non-routable host provided — returns 400, no charge
- URL is unreachable or times out — returns an error status
- Malformed URL input — validation error
- Site returns non-standard responses that prevent header analysis
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"url": "https://example.com",
"grade": "C",
"score": 60,
"checks": [
{
"note": "missing: browsers may load the site over plain HTTP",
"value": null,
"header": "strict-transport-security",
"status": "fail"
}
],
"status": 200,
"finalUrl": "https://example.com/"
}
}Tags
x402
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