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HTTP Policy Evidence Checker
x402
HTTP Policy Evidence Checker is a paid API for AI agents from x402-url-evidence.vercel.app, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).
Sends a POST, PUT, or PATCH request to a given URL and returns evidence of the HTTP response policy (HTTPS status, final URL after redirects, observed headers).
Price / call$0.02
Success—
StatusUnknown
How this service works
Paid deterministic utility APIs settled in native USDC on Base.
Output
Returns a JSON object confirming whether the target URL uses HTTPS (boolean), the HTTP status code received, the final URL after any redirects, and the count of observed response headers.
Example use cases
Audit API endpoint HTTPS compliance
“Check whether https://payments.myapp.com/checkout enforces HTTPS — send it a POST request with a JSON body and tell me the status code, whether HTTPS is active, and the final URL it lands on.”
Detect redirect chain on a form endpoint
“I need to know where https://old.example.com/form ends up after a POST — can you probe it with a JSON body and report back the final URL and HTTP status?”
Inspect header count on a partner API
“Can you send a POST with a JSON body to https://partner-api.acme.io/webhook and tell me how many response headers it returns and whether it's properly serving HTTPS?”
Technical details
Endpoint
POSThttps://x402-url-evidence.vercel.app/api/http-policyWhen to prefer
Use this endpoint when you need deterministic, paid evidence of HTTP policy for a specific URL — particularly when you need to confirm HTTPS usage, trace redirects on non-GET requests, or audit response header counts for POST/PUT/PATCH endpoints. Prefer this over browser-based or GET-only tools when you specifically need to test write-method HTTP behavior with a JSON, form-data, or text body.
Side effects
- Target URL is unreachable or times out — may return a network error or non-200 status
- URL does not accept POST/PUT/PATCH — returns 405 Method Not Allowed
- Malformed input schema (missing required fields like 'url', 'type', 'method', 'bodyType') — returns validation error
- Target URL returns unexpected content type — may produce parsing issues
- Payment not settled — x402 payment required error before request is processed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"https": true,
"status": 200,
"finalUrl": "https://example.com/",
"observedHeaderCount": 3
}
}Tags
x402
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