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WebRef List MIME Types
x402
WebRef List MIME Types 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).
Returns a searchable list of MIME types with content-type matching details for HTTP request/response handling
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
A list of MIME type entries, each including the content-type string (e.g. 'application/json'), top-level media type, subtype, and any associated file extensions or descriptions. Results can be filtered by a search query or top-level type, and limited to a configurable number of entries (default 50).
Example use cases
Content-type header selection for API
“I'm building an HTTP API and need to know the right content-type value to set when returning a MessagePack binary payload — can you look that up for me?”
Filtering MIME types by media category
“Show me all the registered MIME types under the 'audio' top-level type so I can decide which one to use for streaming podcast audio from my server.”
Validating file format support
“I need to check what MIME types exist for font files — can you search for font-related content types so I know what to whitelist in my upload validator?”
Technical details
Endpoint
GEThttps://webref.johnaio281.workers.dev/api/web/list_mime_types?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a programmatic, pay-per-call lookup of MIME types without signup or API keys — ideal for AI agents that need to resolve content-type strings on demand during HTTP request/response construction. Prefer this over static lookup tables when you need searchable, filterable, up-to-date MIME type data. Especially useful within automated workflows that already use the x402 or MPP payment protocol on Base.
Side effects
- No results returned if query string matches nothing in the registry
- Limit parameter ignored or defaulted if invalid value passed
- Invalid HTTP method (POST, PUT, etc.) rejected — only GET, HEAD, DELETE allowed
- Network or worker errors returning 5xx if the underlying Cloudflare worker is unavailable
- Payment failure via x402/MPP if USDC balance is insufficient or payment protocol misconfigured
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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