ISBN Checksum Validator

x402

ISBN Checksum Validator is a paid API for AI agents from agent402.tools, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Validates an ISBN-10 or ISBN-13 checksum and identifies which format the given ISBN belongs to.

Price / call$0.001

Seller volume →—

Success—

StatusUnknown

How this service works

Validate an ISBN-10 or ISBN-13 checksum (hyphens/spaces ignored) and report which format it is.

Output

Returns whether the provided ISBN passes its checksum and identifies the format (ISBN-10 or ISBN-13). Hyphens and spaces in the input are ignored during validation.

Example use cases

Example prompt

“Can you check if 978-3-16-148410-0 is a valid ISBN and tell me whether it's ISBN-10 or ISBN-13?”

Technical details

Endpoint

POSThttps://agent402.tools/api/isbn-validate

When to prefer

Use this endpoint when you need to verify the mathematical validity of an ISBN checksum and identify whether it is ISBN-10 or ISBN-13 format, particularly before ingesting book data into a catalog, database, or retail system. Prefer this over a general regex check since it computes and verifies the actual checksum digit.

Side effects

Input string is not a recognizable ISBN length or format — returns invalid
Checksum digit does not match computed value — returns invalid with format identified
Missing or empty isbn field — likely returns a 400 or validation error
Non-numeric characters beyond hyphens/spaces cause parse failure

Input

Schema · Request body

Field	Type	Description
isbn	string

Output

Schema · Response

{
  "type": "json",
  "example": {
    "valid": true,
    "format": "ISBN-13"
  }
}

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Technical details

Endpoint

POSThttps://agent402.tools/api/isbn-validate

When to prefer

Side effects

Input string is not a recognizable ISBN length or format — returns invalid
Checksum digit does not match computed value — returns invalid with format identified
Missing or empty isbn field — likely returns a 400 or validation error
Non-numeric characters beyond hyphens/spaces cause parse failure

Input

Schema · Request body

Field	Type	Description
isbn	string

Output

Schema · Response

{
  "type": "json",
  "example": {
    "valid": true,
    "format": "ISBN-13"
  }
}