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URL File Checksum
x402
URL File Checksum is a paid API for AI agents from intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Fetches a file at a given URL and returns its SHA-256, SHA-1, SHA-384, MD5 hex digests, SRI integrity string, byte size, content type, last-modified, ETag, and final redirected URL.
Price / call$0.01
Success—
StatusUnknown
How this service works
Checksums of a file at a URL (up to 5 MB): SHA-256, SHA-1 and MD5-free SHA-384 hex digests, the SRI string (sha384-…), byte size, content type, last-modified and ETag, plus the final URL after redirects. Verify downloads, pin script integrity, detect silent changes. $0.01 per file.
Output
Returns a JSON object containing hex digests for SHA-256, SHA-1, SHA-384, and MD5; the SRI string (sha384-…); the file's byte size; HTTP content-type; last-modified header value; ETag; and the final URL after any redirects. Covers files up to 5 MB.
Example use cases
Pin CDN script for SRI enforcement
“I need the SRI integrity hash for https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js so I can add it to my script tag's integrity attribute — can you get me the sha384 string and byte size?”
Detect silent file tampering
“Check whether https://releases.example.com/agent-v2.0.tar.gz has changed since last week — I need its current SHA-256 hash, ETag, and last-modified date so I can compare against my pinned values.”
Verify software download integrity
“I just downloaded an installer and want to make sure it's legit — can you compute the SHA-256 and MD5 checksums for https://downloads.someapp.com/installer-v3.exe and tell me its file size?”
Technical details
Endpoint
GEThttps://intel.rallylive.ca/dev/checksum-fileWhen to prefer
Use this endpoint when you need cryptographic checksums of a specific remote file for integrity verification, SRI pinning, or tamper detection, and the file is under 5 MB. It is uniquely suited for agents that need to verify download authenticity, generate subresource integrity hashes for web assets, or monitor remote files for silent changes — all in a single call that also returns HTTP metadata like ETag and last-modified.
Side effects
- File exceeds 5 MB limit — endpoint returns an error indicating the file is too large
- URL is unreachable or returns a non-200 HTTP status — error with HTTP status code returned
- URL redirects to an inaccessible or private resource — final URL reported but checksums unavailable
- Content-Type indicates unsupported format — partial metadata may be returned
- Network timeout fetching the remote file — timeout error returned
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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