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Dev Reference MIME Type Lookup
x402
Dev Reference MIME Type Lookup is a paid API for AI agents from dev-reference.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-30).
Returns the MIME/media type for a file extension, or the extensions for a given media type, along with IANA registration status and verdict.
Price / call$0.02
Success—
StatusUnknown
How this service works
Media type (MIME) for a file extension, or extensions for a media type, with IANA registration status.
Output
Returns the canonical media type for a given extension (or the list of extensions for a given media type), along with IANA registration status (ianaRegistered boolean), whether the type is conventional-only, the lookup source, a human-readable summary and verdict, and optional fallback or disclaimer fields if the data is degraded or uncertain.
Example use cases
Correct content-type for web assets
“I'm serving .avif image files from my CDN — what Content-Type header should I set, and is that media type officially registered with IANA?”
Reverse lookup extensions for a media type
“Which file extensions are associated with the media type application/vnd.api+json?”
Validate MIME type before upload
“I'm about to send files with Content-Type image/jxl to my API — is that a real, IANA-registered media type and what extensions use it?”
Technical details
Endpoint
GEThttps://dev-reference.x402tookit.com/mime-type?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need authoritative MIME type information with IANA registration status, not just a simple lookup table. Ideal when correctness matters (e.g. setting HTTP Content-Type headers, validating file uploads, implementing file serving logic) and you need to know whether the type is officially standardized or merely conventional.
Side effects
- Unknown or unrecognized extension/type returns null or conventionalOnly flag with no IANA record
- Ambiguous extensions (e.g. .ts which maps to both video and TypeScript) may return partial or annotated results
- Degraded mode if IANA registry is unavailable, with fallback data and disclaimer
- Missing required query parameter returns an error or empty result
- Very new or experimental types may not yet appear in the registry
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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