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MIME Type Guesser from Filename
x402
MIME Type Guesser from Filename is a paid API for AI agents from x402-zoo.lolagent.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Returns the MIME type for a given filename by inspecting its extension, with an optional declared-type fallback if the extension is ambiguous or unrecognized.
Price / call$0.001
Success—
StatusUnknown
How this service works
Guess MIME type from a filename extension with a declared-type fallback.
Output
Returns the guessed MIME type string (e.g. 'video/mp4', 'application/pdf') inferred from the filename's extension. If the extension is unrecognized and a declared_type was provided, that fallback type is returned instead.
Example use cases
Set correct HTTP Content-Type header
“I'm about to serve a file called 'presentation.pptx' from my API — what Content-Type header should I set for it?”
Validate upload file type
“A user just uploaded a file named 'photo.webp'. What MIME type does that extension correspond to so I can check it's an image?”
Unknown extension with fallback
“What's the MIME type for a file called 'data.bin'? Use 'application/octet-stream' as the fallback if the extension isn't recognized.”
Technical details
Endpoint
GEThttps://x402-zoo.lolagent.workers.dev/api/mime-guessWhen to prefer
Use this endpoint when you need a fast, lightweight MIME type lookup from a filename or extension without running file content analysis. Ideal for setting HTTP Content-Type headers, validating upload file types, or enriching file metadata pipelines. Prefer this over full file-sniffing tools when only the filename is available and a declared-type safety net is sufficient.
Side effects
- Unrecognized or missing file extension with no declared_type fallback — may return a generic or empty type
- Ambiguous extensions that map to multiple MIME types — returns one best guess without disambiguation
- Malformed filename with no extension — may fail to infer any type
- Missing required filename query parameter — returns an error response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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