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HTTP Security Headers Grader
x402
HTTP Security Headers Grader is a paid API for AI agents from http-security-headers-grade.x402supply.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-30).
Fetches a public URL and grades its HTTP security headers from A+ to F, returning a score, present/missing headers, per-header findings with fix recommendations, and cookie flag issues.
Price / call$0.01
Success—
StatusUnknown
How this service works
Fetches a public http(s) URL (GET, up to 5 redirects, 10s timeout, body never read) and grades its security headers A+ to F. Returns score, present and missing headers, per-header findings with copy-paste fix values, and cookie flag issues.
Output
Returns a letter grade (A+ to F), a numeric security score, lists of present and missing security headers, per-header findings with copy-paste ready fix values, and any cookie flag issues detected on the given URL.
Example use cases
Pre-launch security header audit
“Before we go live, can you grade the security headers on https://staging.myapp.com and list everything missing so we can fix it before launch?”
Competitor security posture benchmarking
“I want to compare our security headers against a competitor — can you grade https://www.competitor.com and tell me their score and what they're doing right or wrong?”
Ongoing compliance monitoring
“Can you check https://api.myservice.io and tell me if we have all the important security headers in place, including proper cookie flags, and what grade we get?”
Technical details
Endpoint
POSThttps://http-security-headers-grade.x402supply.com/tools/grade_headers?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, structured security header audit of any public web URL — especially useful for getting actionable, copy-paste fix values per header and a standardized A+ to F grade. Prefer it over manual header inspection tools when you want machine-readable findings with remediation guidance in a single API call.
Side effects
- URL is unreachable or times out after 10 seconds
- URL requires authentication or is not publicly accessible
- Redirect chain exceeds 5 hops
- Invalid or malformed URL provided
- Non-HTTP/HTTPS scheme provided
- Target server returns no headers or an error status
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | Public http or https URL to grade, e.g. https://github.com |
Output
Schema · Response
{
"type": "json",
"example": {
"url": "https://example.com",
"fixes": {
"referrer-policy": "Referrer-Policy: strict-origin-when-cross-origin",
"x-frame-options": "X-Frame-Options: DENY",
"permissions-policy": "Permissions-Policy: camera=(), microphone=(), geolocation=(), payment=()",
"x-content-type-options": "X-Content-Type-Options: nosniff",
"content-security-policy": "Content-Security-Policy: default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'self'",
"strict-transport-security": "Strict-Transport-Security: max-age=63072000; includeSubDomains; preload",
"cross-origin-opener-policy": "Cross-Origin-Opener-Policy: same-origin",
"cross-origin-embedder-policy": "Cross-Origin-Embedder-Policy: require-corp",
"cross-origin-resource-policy": "Cross-Origin-Resource-Policy: same-origin"
},
"grade": "F",
"score": 0,
"status": 200,
"cookies": [],
"missing": [
"strict-transport-security",
"content-security-policy",
"x-frame-options",
"x-content-type-options",
"referrer-policy",
"permissions-policy",
"cross-origin-opener-policy",
"cross-origin-embedder-policy",
"cross-origin-resource-policy"
],
"present": [],
"finalUrl": "https://example.com/",
"findings": [
{
"fix": "Strict-Transport-Security: max-age=63072000; includeSubDomains; preload",
"value": null,
"header": "strict-transport-security",
"points": 0,
"status": "fail",
"message": "HSTS header is missing.",
"maxPoints": 18
},
{
"fix": "Content-Security-Policy: default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'self'",
"value": null,
"header": "content-security-policy",
"points": 0,
"status": "fail",
"message": "Content-Security-Policy is missing.",
"maxPoints": 25
},
{
"fix": "X-Frame-Options: DENY",
"value": null,
"header": "x-frame-options",
"points": 0,
"status": "fail",
"message": "No X-Frame-Options or CSP frame-ancestors, so the page can be framed (clickjacking).",
"maxPoints": 10
},
{
"fix": "X-Content-Type-Options: nosniff",
"value": null,
"header": "x-content-type-options",
"points": 0,
"status": "fail",
"message": "X-Content-Type-Options is missing.",
"maxPoints": 10
},
{
"fix": "Referrer-Policy: strict-origin-when-cross-origin",
"value": null,
"header": "referrer-policy",
"points": 0,
"status": "fail",
"message": "Referrer-Policy is missing.",
"maxPoints": 10
},
{
"fix": "Permissions-Policy: camera=(), microphone=(), geolocation=(), payment=()",
"value": null,
"header": "permissions-policy",
"points": 0,
"status": "fail",
"message": "Permissions-Policy is missing.",
"maxPoints": 8
},
{
"fix": "Cross-Origin-Opener-Policy: same-origin",
"value": null,
"header": "cross-origin-opener-policy",
"points": 0,
"status": "fail",
"message": "Cross-Origin-Opener-Policy is missing.",
"maxPoints": 5
},
{
"fix": "Cross-Origin-Embedder-Policy: require-corp",
"value": null,
"header": "cross-origin-embedder-policy",
"points": 0,
"status": "fail",
"message": "Cross-Origin-Embedder-Policy is missing.",
"maxPoints": 4
},
{
"fix": "Cross-Origin-Resource-Policy: same-origin",
"value": null,
"header": "cross-origin-resource-policy",
"points": 0,
"status": "fail",
"message": "Cross-Origin-Resource-Policy is missing.",
"maxPoints": 4
}
],
"redirects": 0
}
}Tags
x402
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