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Sentinel Security Header Inspector
x402
Sentinel Security Header Inspector is a paid API for AI agents from sentinel.rootstuff.io, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Fetches response headers from a URL and reports on the presence and quality of HTTP security headers
Price / call$0.01
Success—
StatusUnknown
How this service works
Response headers and security-header report for a URL
Output
Returns the full set of HTTP response headers received from the target URL, along with a security-focused report highlighting which security headers (e.g. Content-Security-Policy, Strict-Transport-Security, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, Permissions-Policy) are present, absent, or misconfigured.
Example use cases
Security audit before launch
“Before we go live, can you check the security headers on https://staging.myapp.com and tell me which important ones like CSP, HSTS, and X-Content-Type-Options are missing?”
Compliance check for partner API
“I need to verify that our partner's API at https://api.partner-service.com returns the right security headers — can you fetch and report on what they're sending?”
Spot-check competitor website headers
“What security headers is https://www.competitorsite.com returning? I want to see if they have Content-Security-Policy and HSTS configured.”
Technical details
Endpoint
GEThttps://sentinel.rootstuff.io/x402/headersWhen to prefer
Choose this endpoint when you need a quick, paid-per-call security header inspection of a specific URL without setting up your own HTTP client — especially useful in agent workflows that need to audit web properties, verify compliance, or report on header posture as part of a broader security check. Prefer over manual fetching when you want a structured report on security headers specifically, not just raw header values.
Side effects
- Private or non-public hosts rejected — only public HTTP/HTTPS URLs are supported
- Target URL is unreachable or returns a network error — endpoint may return an error or empty header set
- URL is malformed or missing scheme — input validation failure
- Target returns a redirect that resolves to a non-public host — may be blocked
- Rate limiting if called excessively against the same host
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | The http(s) URL to request. Public hosts only. |
Tags
x402
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