ToolVet
78trust / 100

Verify Hash

by ScrapeCheck in Security & trust

x402 APIPassing, checked 2 h ago

Checksum tier (deterministic, no LLM): verifies the exact bytes served at a public URL hash to a claimed sha256, by independent double re-fetch. Use it to confirm a download or artifact matches its published checksum. Bodies up to 3 MB; dynamic pages return unverifiable, never a guess. sha256 only. First 100 checks per client are free: resend with header X-Use-Free-Allowance: yes and no payment to use them.

POST https://scrapecheck.fly.dev/verify-hash

Last 30 days

All checks passedSome failedAll failedNot checked
Uptime
100%
Response time
291 ms typical, 360 ms slowest 5%
Last check
2 h ago
Next check
any minute now

How to call it

# See the payment challenge (nothing is charged)
curl -i -X POST "https://scrapecheck.fly.dev/verify-hash" \
  -H "content-type: application/json" \
  -d '{"claim":{"sha256":"92fa12e267971550b3d78a1d5aea6cc20586c66bead4fa89e9952f1604ac9ab0"},"url":"https://scrapecheck.fly.dev/.well-known/402index-verify.txt"}'
import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { ExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client().register(
  "eip155:8453",
  new ExactEvmScheme(privateKeyToAccount(process.env.AGENT_KEY)),
);
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? Preflight it first for $0.005:
// GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fscrapecheck.fly.dev%2Fverify-hash
const res = await pay("https://scrapecheck.fly.dev/verify-hash", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({"claim":{"sha256":"92fa12e267971550b3d78a1d5aea6cc20586c66bead4fa89e9952f1604ac9ab0"},"url":"https://scrapecheck.fly.dev/.well-known/402index-verify.txt"}),
});
console.log(await res.json());

Example input

{
  "claim": {
    "sha256": "92fa12e267971550b3d78a1d5aea6cc20586c66bead4fa89e9952f1604ac9ab0"
  },
  "url": "https://scrapecheck.fly.dev/.well-known/402index-verify.txt"
}

Example output

{
  "check_type": "url_hash_v1",
  "confidence": 0.95,
  "engine": "web_field_v1/0.2.1+6739b7f9ebf8",
  "evidence": {
    "lens_votes": {},
    "refetch_excerpt": "sha256:92fa12e2…",
    "refetched_at": "2026-08-28T00:00:00.000Z",
    "second_fetch_at": "2026-08-28T00:00:01.000Z"
  },
  "key_id": "k2",
  "reasons": [
    "the body served at the URL hashes to the claimed sha256 (64 bytes, stable across two immediate fetches)"
  ],
  "signature": "ed25519:…",
  "source_hash": "sha256:…",
  "verdict": "pass",
  "verdict_id": "00000000-0000-0000-0000-000000000000",
  "verifier_url": "https://scrapecheck.fly.dev"
}

Security scan

  • No findings. We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

WhenResultHTTPTimePrice
2 h agoPassed402144 ms$0.002
5 h agoPassed402330 ms$0.002
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