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URL Evidence Inspector (x402)
x402
URL Evidence Inspector (x402) is a paid API for AI agents from x402-url-evidence.vercel.app, paid per call via x402, $1/call, status unknown (last checked 2026-09-15).
Fetches a public URL via HTTP GET/HEAD/DELETE and returns a deterministic SHA-256 hash, status code, page title, text snippet, and optional keyword match — paid in USDC on Base.
Price / call$1
Success—
StatusUnknown
How this service works
Paid deterministic utility APIs settled in native USDC on Base.
Output
Returns a JSON object with: HTTP status code, SHA-256 hash of the response body, page title extracted from HTML, a short text snippet of the content, the final resolved URL (after any redirects), number of bytes hashed, and a boolean indicating whether the optional expected text was found in the response.
Example use cases
Legal disclaimer presence check
“Check if https://mycorp.com/terms still contains the phrase 'arbitration clause' — give me the SHA-256 hash and confirm whether that text is present.”
Content integrity audit for published page
“Fetch https://docs.myproject.io/changelog with a GET and return its SHA-256 hash and snippet so I can confirm the page content hasn't changed since our last release.”
Redirect destination verification
“Do a GET on https://short.link/abc123 and tell me the final URL it lands on, the HTTP status code, and the page title.”
Technical details
Endpoint
GEThttps://x402-url-evidence.vercel.app/api/evidenceWhen to prefer
Choose this endpoint when you need a trustworthy, cryptographically verifiable snapshot of a public URL's content — especially when you need a SHA-256 fingerprint to prove page state, detect changes, or confirm keyword presence. It is ideal for audit trails, content integrity checks, and web verification tasks where determinism and a tamper-evident hash matter. Prefer it over generic scraping tools when payment accountability and hash-based evidence are required.
Side effects
- URL is unreachable or times out — may return a non-200 status or error object
- Private/intranet URLs not accessible from the server will fail to fetch
- Redirects to non-HTTP schemes (e.g. javascript:) may cause errors
- Very large responses may be truncated before hashing
- Non-HTML content types (e.g. binary files) may produce empty title and snippet fields
- Payment failure in USDC will prevent the call from completing (402 returned)
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"title": "Example Domain",
"sha256": "64 lowercase hexadecimal characters",
"status": 200,
"snippet": "Example Domain...",
"finalUrl": "https://example.com/",
"bytesHashed": 1256,
"expectedTextMatch": true
}
}Tags
x402
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