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Delx Commerce PDF Header Sniff
x402
Delx Commerce PDF Header Sniff is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-01).
Detects whether a base64-encoded file prefix represents a valid PDF by inspecting its binary header bytes.
Price / call$0.001
Success—
StatusUnknown
How this service works
Pay-per-result APIs for agents. No signup. Exact price. Verifiable delivery. USDC on Base + Solana via x402.
Output
Returns a JSON object with a boolean 'is_pdf' indicating whether the file header matches PDF format, the length of the decoded prefix examined, and a schema version string ('delx/util-pdf-header-sniff/v1').
Example use cases
Pre-validate upload before PDF extraction
“Before I try to parse this file as a PDF, can you sniff its header to confirm it's actually a valid PDF? Here's the base64 prefix: 'JVBERi0xLjMgJ...'”
Filter non-PDF files in document pipeline
“I'm getting files from users and need to quickly check which ones are PDFs before sending them to my document extractor — can you sniff the file header from this base64 prefix to tell me if it's a PDF?”
Detect misnamed PDF attachments
“Someone sent me a file with a .txt extension but I suspect it might actually be a PDF — can you look at the first few bytes from this base64 prefix and tell me if it's really a PDF?”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/pdf-header-sniff?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, cheap ($0.001 USDC) programmatic check to confirm a file is a PDF before committing to heavier processing like full PDF parsing or extraction. Ideal for agent pipelines that receive arbitrary file uploads and need to gate on file type without downloading or parsing the full file.
Side effects
- Missing or empty base64_prefix field returns an error
- Invalid base64 encoding causes a decode failure
- Prefix too short to contain a full PDF magic bytes signature may return false negatives
- Payment failure via x402 protocol blocks the request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| base64_prefix | string | Base64 prefix of a file for sniffing |
Output
Schema · Response
{
"type": "json",
"example": {
"is_pdf": true,
"schema": "delx/util-pdf-header-sniff/v1",
"decoded_prefix_len": 8
}
}Tags
x402
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