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HTTP Security Headers Checker
x402
HTTP Security Headers Checker is a paid API for AI agents from api.strale.io, paid per call via x402, $0.054001/call, status unknown (last checked 2026-09-15).
Checks a URL's HTTP response headers for security best practices (HSTS, CSP, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, Permissions-Policy) and returns a letter grade A–F.
Price / call$0.054001
Success—
StatusUnknown
How this service works
Check HTTP response headers for security best practices: HSTS, CSP, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, Permissions-Policy. Returns grade A-F.
Output
Returns a security grade from A to F and a breakdown of whether each key security header (HSTS, CSP, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, Permissions-Policy) is present and correctly configured on the given URL.
Example use cases
Example prompt
“Can you check the security headers on https://myapp.example.com and tell me what grade it gets — specifically whether it has HSTS, CSP, and X-Frame-Options set correctly?”
Technical details
Endpoint
GEThttps://api.strale.io/x402/header-security-checkWhen to prefer
Use this endpoint when you need a quick, structured security header audit for a given URL with a clear letter grade and per-header breakdown. Prefer this over a full SEO or accessibility audit when the specific concern is HTTP security posture, particularly for HSTS, CSP, clickjacking protection, and MIME-type sniffing prevention.
Side effects
- Invalid or unreachable URL returns an error or failed check result
- URL uses a non-HTTP scheme (e.g. ftp://) — may not be supported
- Rate limiting or upstream timeout if the target server is slow
- Missing required 'url' query parameter returns a validation error
Input
{
"url": "https://www.example.com"
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| urlrequired | string |
Output
{
"url": "https://www.example.com",
"cors": null,
"_meta": {
"payment": {
"method": "x402",
"price_usd": 0.054000000000000006,
"settlement_id": "0x66862407ce6871d4bed5905373d293debf7600aee73774445dd849e13fd6553c"
},
"capability": "header-security-check",
"latency_ms": 21,
"provenance": {
"source": "http-headers",
"fetched_at": "2026-06-16T01:20:19.296Z"
}
},
"grade": "F",
"score": 10,
"server": "cloudflare",
"missing": [
{
"header": "strict-transport-security",
"severity": "high",
"recommendation": "Add: Strict-Transport-Security: max-age=31536000; includeSubDomains"
},
{
"header": "content-security-policy",
"severity": "high",
"recommendation": "Add Content-Security-Policy to prevent XSS and injection attacks"
},
{
"header": "x-frame-options",
"severity": "medium",
"recommendation": "Add: X-Frame-Options: DENY (or SAMEORIGIN) to prevent clickjacking"
},
{
"header": "x-content-type-options",
"severity": "medium",
"recommendation": "Add: X-Content-Type-Options: nosniff to prevent MIME sniffing"
},
{
"header": "referrer-policy",
"severity": "medium",
"recommendation": "Add: Referrer-Policy: strict-origin-when-cross-origin"
},
{
"header": "permissions-policy",
"severity": "medium",
"recommendation": "Add Permissions-Policy to restrict browser features (camera, microphone, etc.)"
}
],
"present": [],
"response_status": 200
}Schema · Response
{
"grade": {
"type": "string"
},
"score": {
"type": "integer"
},
"missing": {
"type": "array"
},
"present": {
"type": "array"
}
}Tags
x402
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