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Delx Ext From MIME
x402
Delx Ext From MIME is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Returns the canonical file extension for a given MIME type using a local, first-party JSON lookup.
Price / call$0.001
Success—
StatusUnknown
How this service works
Guess extension from MIME type. Call when you name agent-generated files from content-type. Returns ext, mime, known for $0.001 USDC via x402 on Base. No network, no keys, no retention; first-party local JSON only. Results are advisory; the caller owns budgets, auth, and production controls.
Output
Returns a JSON object containing the resolved file extension (ext), the canonical MIME type (mime), and a boolean (known) indicating whether the MIME type was recognized in the local lookup table.
Example use cases
Naming agent-generated download files
“I'm saving a file that came back with content-type 'application/vnd.ms-excel' — what file extension should I use when I write it to disk?”
Validating upload extension matches MIME
“A user uploaded a file claiming it's a PNG but the server detected MIME type 'image/gif' — what extension should that actually have?”
Labeling AI-generated media output
“My agent just produced an audio clip and the content-type is 'audio/ogg' — what file extension do I attach to it before sending it to the user?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/ext-from-mimeWhen to prefer
Use this endpoint when an AI agent needs to programmatically determine the correct file extension from a MIME/content-type string — especially when saving, naming, or routing agent-generated or downloaded files. Prefer it over regex guessing or hardcoded maps because it uses a maintained, first-party local JSON source with a known flag to signal confidence. It requires no external network calls, no API keys, and has no data retention, making it safe for pipeline use.
Side effects
- Unrecognized MIME type returns known: false with a best-guess or null extension
- Malformed or missing mime field returns a validation error
- Payment failure via x402 prevents the call from executing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| mime | string | Input field: mime. |
Output
Schema · Response
{
"type": "json",
"example": {
"ext": "png",
"mime": "image/png",
"known": true,
"schema": "delx/util-ext-from-mime/v1"
}
}Tags
x402
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