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WebRef MIME Type Lookup
x402
WebRef MIME Type Lookup is a paid API for AI agents from webref.johnaio281.workers.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-22).
Looks up MIME type information for a file extension or content-type string, returning canonical type, subtypes, and content-type matching guidance for HTTP responses
Price / call$0.003
Success—
StatusUnknown
How this service works
Web standards and time reference for AI agents: HTTP status codes with what the client should do, retry semantics, MIME types and content-type matching, request-method safety and idempotency, plus deadline arithmetic - time until a moment, weekday and business-day checks, duration conversion and Unix timestamps. Pay per call in USDC on Base via x402 or USDC on Tempo via MPP. No signup, no API key, no KYC.
Output
Returns the canonical MIME type string (e.g. 'application/wasm'), associated file extensions, content-type matching rules, and guidance on correct usage in HTTP headers for the queried extension or type.
Example use cases
Correct content-type for API response
“I'm building an HTTP API that returns JSON — what exact content-type header value should I set on the response?”
Serving static files with right headers
“My web server needs to serve .svg image files — what MIME type should I use in the Content-Type header for those GET requests?”
Validating file upload content types
“A user is uploading a .csv file to my app via GET-based pre-signed URL — what's the canonical MIME type I should expect and validate against?”
Technical details
Endpoint
GEThttps://webref.johnaio281.workers.dev/api/web/mime_type?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs to programmatically determine the correct MIME type or Content-Type header for a given file extension or media type without relying on local libraries or hardcoded mappings. Particularly useful in serverless or sandboxed agent environments where file-type libraries are unavailable. Prefer over generic web search when you need a structured, authoritative answer with HTTP-specific context.
Side effects
- Unknown or unrecognized file extension returns a 404 or empty result
- Passing an unsupported HTTP method (not GET, HEAD, or DELETE) results in a validation error
- Malformed or missing required fields return a schema validation error
- Ambiguous extensions with multiple MIME types may return the most common match only
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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