PennyRail MIME Type Lookup

x402

PennyRail MIME Type Lookup 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 for a given file extension or filename via a paid micro-settlement API

Price / call$0.001

Seller volume →—

Success—

StatusUnknown

How this service works

Machine-readable settlement service

Output

Returns the standard MIME type string (e.g. 'image/webp', 'application/pdf') corresponding to the provided file extension or filename input.

Example use cases

Set correct HTTP Content-Type header

“I'm building an API that serves files — can you look up the correct MIME type for .svg files so I can set the right Content-Type header in my responses?”

Validate file upload content type

“A user is uploading a .xlsx spreadsheet — what MIME type should I expect and validate against for that file format?”

Identify media type for audio file

“I need to serve an .ogg audio file from my server — can you look up the correct MIME content type for .ogg so I know what to put in the headers?”

Technical details

Endpoint

POSThttps://pennyrail.vercel.app/api/p/nano/mime.lookup--mime

When to prefer

Use this endpoint when you need a quick, authoritative MIME type lookup for a file extension or filename and are operating in an x402 micro-payment environment. Prefer it over hardcoding MIME type maps or bundling the mime npm package directly when you want a lightweight, stateless remote call within an agent workflow that already handles USDC micro-payments.

Side effects

Unknown or unrecognized file extension returns null or empty result
Malformed input object missing required fields may return a 400 error
Payment failure via x402 protocol results in 402 Payment Required response
Ambiguous extensions with multiple MIME types may return only the most common one

Input

Schema · Request body

Field	Type	Description
inputrequired	object

Output

Schema · Response

{
  "type": "object",
  "additionalProperties": true
}

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Example use cases

Set correct HTTP Content-Type header

“I'm building an API that serves files — can you look up the correct MIME type for .svg files so I can set the right Content-Type header in my responses?”

Validate file upload content type

“A user is uploading a .xlsx spreadsheet — what MIME type should I expect and validate against for that file format?”

Identify media type for audio file

“I need to serve an .ogg audio file from my server — can you look up the correct MIME content type for .ogg so I know what to put in the headers?”

Technical details

Endpoint

POSThttps://pennyrail.vercel.app/api/p/nano/mime.lookup--mime

When to prefer

Side effects

Unknown or unrecognized file extension returns null or empty result
Malformed input object missing required fields may return a 400 error
Payment failure via x402 protocol results in 402 Payment Required response
Ambiguous extensions with multiple MIME types may return only the most common one

Input

Schema · Request body

Field	Type	Description
inputrequired	object

Output

Schema · Response

{
  "type": "object",
  "additionalProperties": true
}