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402utils MIME Type Detector
x402
402utils MIME Type Detector is a paid API for AI agents from 402utils.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).
Detects a file's true MIME type from its magic-number byte signature, returning type, extension, confidence, category, and executable flag
Price / call$0.002
Success—
StatusUnknown
How this service works
Detect a file's true MIME type from its magic-number byte signature — not from a declared extension or Content-Type. Send the raw bytes (≤10 MB) as the body, or JSON { bytes: base64 }. Returns {mime, extension, confidence, description, category, executable}. Covers images, documents (incl. OOXML/OpenDocument), archives, audio/video, fonts and executables (which are flagged). Security check for file pipelines. Not a barcode/QR reader.
Output
Returns a JSON object with fields: mime (the detected MIME type string), extension (canonical file extension), confidence (detection confidence score), description (human-readable file type description), category (broad category such as image/document/archive), and executable (boolean flag indicating if the file is an executable, useful for security screening)
Example use cases
Example prompt
“I just received an uploaded file with a .jpg extension but I'm not sure it's really an image — can you check its actual MIME type from the raw bytes and tell me if it's an executable or something dangerous?”
Technical details
Endpoint
POSThttps://402utils.com/v1/mime-detectWhen to prefer
Use this endpoint when you need to determine a file's true type based on its actual binary content rather than trusting its declared extension or Content-Type header. Ideal for security-sensitive file upload pipelines, content validation, and detecting disguised executables. Covers a wide range of formats including images, OOXML/OpenDocument, archives, audio/video, fonts, and executables.
Side effects
- File exceeds 10 MB limit — request rejected
- Unrecognized byte signature — low confidence or unknown MIME returned
- Malformed base64 input — parse error
- Empty body sent — no bytes to analyze
- Network timeout for large files near the size limit
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| bytes | string | The file's raw bytes as base64 (alternative to sending them raw). |
Tags
x402
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