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Delx ISBN Check
x402
Delx ISBN Check is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-11).
Validates ISBN-10 and ISBN-13 checksum correctness for a given ISBN string
Price / call$0.001
Success—
StatusUnknown
How this service works
ISBN-10/ISBN-13 checksum validation for $0.001 USDC. Call when you need this bounded result without an API key or subscription. Returns machine-readable JSON via x402 on Base or Solana. Limitation: results cover only the supplied input or one bounded public endpoint at request time; callers must verify before acting.
Output
Returns whether the provided ISBN string passes checksum validation, along with the detected format (ISBN-10 or ISBN-13) and the validation outcome (valid/invalid).
Example use cases
Pre-catalog ISBN sanity check
“Before I add this book to my store catalog, can you verify that the ISBN 0-306-40615-2 has a valid checksum?”
Bulk data cleaning validation
“I have an ISBN that came from a user entry — 9780141036144 — can you check if it's a properly formed ISBN-13 with the right check digit?”
Publisher data integrity check
“We received a manuscript submission with ISBN 978-0-7432-7356-5 — validate that the checksum is correct before we register it.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/isbn-check?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a lightweight, programmatic checksum validation of an ISBN-10 or ISBN-13 identifier before storing, querying, or displaying it — especially in automated catalog pipelines, user-input sanitization flows, or data quality checks where calling a full book metadata API would be overkill.
Side effects
- Invalid or missing ISBN input returns a validation error
- Non-numeric or malformed ISBN string (wrong length, unexpected characters) returns invalid result
- Network timeout or service unavailability
- Payment failure via x402 protocol preventing the call
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| outputrequired | object |
Output
Schema · Response
{
"type": "json",
"example": {}
}Tags
x402
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