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URL File Type Detector
x402
URL File Type Detector 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).
Detects the true MIME type of a file at a URL by reading magic bytes, then flags mismatches against the declared Content-Type header and URL extension
Price / call$0.01
Success—
StatusUnknown
How this service works
Detects the real type of a file at a URL from its magic bytes (40+ signatures: images, audio, video, archives, PDF, Office, executables, fonts, WASM, SQLite, text/JSON/HTML) and compares with the declared Content-Type and the URL extension, flagging mismatches. Also returns size, content-disposition and whether the server supports ranges. Reads only the first 64 KB. $0.01 per file.
Output
Returns the detected MIME type inferred from magic bytes (covering 40+ signatures including images, audio, video, archives, PDF, Office, executables, fonts, WASM, SQLite, and text formats), the declared Content-Type from the server, the file extension from the URL, any mismatch flags between those three, the file size, the content-disposition header, and whether the server supports byte-range requests. Only the first 64 KB of the file is fetched.
Example use cases
Detect disguised executable downloads
“I have this download link — https://cdn.example.com/installer.zip — can you check what the file really is at the byte level and tell me if it matches the .zip extension and the Content-Type the server sends back?”
Validate image URL before processing
“Before I pass this URL to my image pipeline, can you verify that https://uploads.example.com/avatar.jpg is actually a JPEG image and not something else disguised as one?”
Audit suspicious file served from CDN
“This CDN URL is claiming to serve an MP4 video but users are reporting issues — can you inspect https://media.example.com/video.mp4 to see what type the magic bytes reveal and whether there's a mismatch with the declared content type?”
Technical details
Endpoint
GEThttps://intel.rallylive.ca/dev/file-typeWhen to prefer
Choose this endpoint when you need to verify the true binary type of a file at a remote URL without downloading the whole file, especially when you suspect MIME type spoofing, mismatched extensions, or want to validate a file before passing it to a downstream processor. It is distinct from content-analysis endpoints because it uses low-level magic byte inspection rather than parsing or rendering the file.
Side effects
- URL is unreachable or returns a non-200 status — detection fails with an error
- File requires authentication and returns 401/403 — no bytes can be read
- Server does not return any Content-Type header — comparison is partial
- File is smaller than the magic byte signature region — detection may be inconclusive
- Unknown file format not among 40+ supported signatures — type reported as unknown
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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