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ScrapeCheck Hash Verification
x402
ScrapeCheck Hash Verification is a paid API for AI agents from scrapecheck.fly.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).
Independently re-fetches a public URL twice and verifies that the served bytes match a claimed SHA-256 checksum
Price / call$0.002
Success—
StatusUnknown
How this service works
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.
Output
A structured response indicating whether the bytes currently served at the given URL match the claimed SHA-256 hash, based on two independent fetches. Includes the actual computed hash, match status (true/false), and notes if the page is dynamic or the body exceeds the 3 MB limit (in which case verification is unverifiable rather than guessed).
Example use cases
Software release integrity check
“Before I install this package, can you confirm that https://github.com/example/project/releases/download/v3.0/binary.tar.gz has a sha256 of e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855? I want to be sure the file hasn't been swapped out.”
Verifying a deployed artifact before deploy
“We're about to deploy from a build artifact at https://builds.internal.example.com/artifacts/service-v1.4.2.zip — please verify its SHA-256 is 9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a8 so we know it matches what CI published.”
Auditing a vendor-distributed file
“A vendor sent us a download link for https://vendor.example.com/sdk/sdk-latest.zip and claims its sha256 is 2c624232cdd221771294dfbb310acbc4a56ae0e. Can you independently fetch it twice and confirm whether that hash is correct?”
Technical details
Endpoint
POSThttps://scrapecheck.fly.dev/verify-hashWhen to prefer
Choose this endpoint when you need deterministic, tamper-evident confirmation that a specific public URL is currently serving bytes that match a known SHA-256 hash — for example, verifying software releases, build artifacts, or distributed files before installation or deployment. It is preferable over manual checksum tools when you need an independent double-fetch (not trusting a single download) and an auditable result. Use it when your content is static (not dynamically rendered) and under 3 MB. For verifying JSON field values, XML paths, redirects, or text presence on a page, use sibling ScrapeCheck tiers instead.
Side effects
- URL is not publicly accessible or returns non-200 status — verification fails with an error
- Response body exceeds 3 MB limit — endpoint returns unverifiable status, never a guess
- Dynamic page content varies between the two fetches — returns unverifiable, not a match/no-match verdict
- URL uses a non-HTTPS scheme — rejected as invalid input
- SHA-256 hash format is malformed or uses an unsupported algorithm — request rejected
- Network timeout or transient fetch error on one or both fetches — verification fails with error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | public HTTPS URL |
| claim | object | see the route description; there is no asked field - this tier adjudicates exactly what it accepts |
Output
Schema · Response
{
"type": "json",
"example": {
"engine": "web_field_v1/0.2.0+2ae28205cac4",
"key_id": "k2",
"reasons": [
"the body served at the URL hashes to the claimed sha256 (64 bytes, stable across two immediate fetches)"
],
"verdict": "pass",
"evidence": {
"lens_votes": {},
"refetched_at": "2026-08-28T00:00:00.000Z",
"refetch_excerpt": "sha256:92fa12e2…",
"second_fetch_at": "2026-08-28T00:00:01.000Z"
},
"signature": "ed25519:…",
"check_type": "url_hash_v1",
"confidence": 0.95,
"verdict_id": "00000000-0000-0000-0000-000000000000",
"source_hash": "sha256:…",
"verifier_url": "https://scrapecheck.fly.dev"
}
}Tags
x402
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