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Delx Content Type Sniff
x402
Delx Content Type Sniff 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).
Heuristically detects the MIME content-type of data given a sample of bytes and/or a filename, returning a deterministic machine-readable JSON result.
Price / call$0.001
Success—
StatusUnknown
How this service works
Heuristic content-type sniff from sample bytes or filename — first-party local utility for agent preflight and proven micro-utils expansion. Returns deterministic machine-readable JSON for $0.001 USDC via x402 on Base. Execution is first-party, local-only, stateless, and memory-only with no paid upstream, no input retention, no web search, no live RPC, and no mediagen. Results are advisory; the caller owns authorization, budgets, and production controls. Sibling of Delx routes that already conv…
Output
A deterministic JSON object indicating the detected MIME content-type (e.g. 'application/pdf', 'image/png', 'text/csv') inferred heuristically from the provided sample bytes and/or filename. Results are advisory and stateless.
Example use cases
Preflight check before file upload
“Before I upload this file, can you figure out what content type it is? The filename is 'export.csv' and here's a sample of its bytes: 'aWQsbmFtZSxhZ2UK'.”
Validate attachment type in agent pipeline
“I need to validate what kind of file an email attachment is before passing it downstream — the filename is 'invoice_scan.unknown' and the first bytes are 'UEsDBBQABgAIAAAAIQ'.”
Identify mystery file format from raw bytes
“I have some raw bytes with no filename and I need to know what format they are — can you sniff the content type from this sample: 'iVBORw0KGgoAAAANSUhEUgAA'?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/content-type-sniffWhen to prefer
Use this endpoint when an AI agent needs a fast, stateless, zero-retention preflight check on a file's content type before routing, processing, or validating it — especially when no external HTTP request or file system access is available. Prefer over HTTP HEAD requests or server-side probing when privacy matters (no data retention) or when operating in a sandboxed agent context. Best for lightweight pipelines where a $0.001 per-call cost is acceptable and deterministic local heuristics are sufficient.
Side effects
- Ambiguous input: if neither sample nor filename is provided, detection may return an unknown or generic type
- Low-entropy sample: very short or binary-ambiguous byte samples may yield low-confidence or incorrect MIME types
- Unsupported format: rare or proprietary file types may not be recognized and return a fallback type
- Payment failure: x402 micropayment not accepted results in rejection before execution
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| sample | string | Input field: sample. |
| filename | string | Input field: filename. |
Output
Schema · Response
{
"type": "json",
"example": {
"note": "local sniff only; not full MIME database",
"schema": "delx/util-content-type-sniff/v1",
"filename": "doc.pdf",
"confidence": "heuristic",
"content_type": "application/pdf",
"sample_bytes": 13
}
}Tags
x402
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