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PennyRail MIME Lookup — Extension to MIME Type
x402
PennyRail MIME Lookup — Extension to MIME Type is a paid API for AI agents from pennyrail.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Looks up the MIME type(s) associated with a given file extension using the mime-extensions mapping
Price / call$0.001
Success—
StatusUnknown
How this service works
Machine-readable settlement service
Output
Returns an object containing the MIME type string(s) associated with the provided file extension, suitable for use in HTTP Content-Type headers or file handling logic.
Example use cases
Setting correct HTTP content-type header
“I'm building a file server and need to know the right content-type header to use when serving .svg files — can you look that up for me?”
Validating file upload MIME type
“My app accepts user uploads and I want to double-check what MIME type a .webp file should have before storing it.”
Generating API response metadata
“I'm generating an API that returns files and need to know the official MIME type for .csv so I can set the correct content-type in my responses.”
Technical details
Endpoint
POSThttps://pennyrail.vercel.app/api/p/nano/mime.lookup--mime-extensionsWhen to prefer
Use this endpoint when you need a quick, programmatic lookup of the MIME type for a given file extension, especially in micropayment-native (x402) agent workflows where per-call billing is acceptable. Prefer over bundling a full mime library when operating in serverless or constrained environments.
Side effects
- Unknown or unsupported file extension returns empty or null result
- Malformed input object causes validation error
- Payment failure via x402 prevents request from being processed
- Vercel cold start may add latency on first call
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
Schema · Response
{
"type": "object",
"additionalProperties": true
}Tags
x402
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