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Delx Content Type Guess
x402
Delx Content Type Guess is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).
Guesses the MIME type for a given filename, file path, or URL based solely on its extension
Price / call$0.003
Success—
StatusUnknown
How this service works
Guess a MIME type from a filename, path, or URL extension — call when guessing MIME type from an extension. Use on text/URLs the agent already holds—adjacent to high-volume extract demand, never advertised as general web or X search. Returns deterministic machine-readable JSON for $0.003 USDC via x402 on Base. Execution is first-party, local-only, stateless, and memory-only with no paid upstream, no input retention, and no claim of live chain tip, web search, or media generation. Results are ad…
Output
A deterministic JSON object containing the guessed MIME type string (e.g. 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet') derived from the file extension in the provided filename, path, or URL. No network calls are made; the result is computed locally from extension-to-MIME mappings.
Example use cases
Setting HTTP Content-Type headers
“I'm about to serve a file named 'profile_photo.webp' — what Content-Type header value should I set for it?”
Validating upload MIME type
“A user uploaded a file called 'dataset.parquet' — can you figure out the correct MIME type from the filename so I can validate it before storing?”
Annotating file metadata pipeline
“I have a list of filenames like 'slides.pptx' and 'notes.md' that need MIME type labels — what's the content type for 'slides.pptx'?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/content-type-guessWhen to prefer
Use this endpoint when you already hold a filename, path, or URL and need a quick, deterministic, stateless MIME type guess purely from the extension — no file content is read and no network fetch is performed. Prefer it over manual lookup tables or regex when you need a consistent, machine-readable JSON result integrated into a workflow. Not suitable if you need to detect content type from actual file bytes or magic numbers.
Side effects
- Unknown or uncommon extension returns a generic fallback MIME type such as 'application/octet-stream'
- Filename with no extension may return null or a default type
- Ambiguous extensions shared by multiple MIME types may return the most common mapping rather than the precise one
- Malformed input (empty string) may return an error or default
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| filename | string | Filename, path, or URL used only for extension/MIME guess. |
Output
Schema · Response
{
"type": "json",
"example": {
"known": true,
"schema": "delx/util-content-type-guess/v1",
"filename": "report.PDF",
"extension": "pdf",
"content_type": "application/pdf"
}
}Tags
x402
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