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ISBN-10 / ISBN-13 Checksum Validator & Bi-Directional Converter

Validates the Modulo-11 / Modulo-10 check digit of any ISBN and converts ISBN-10 to ISBN-13.

Call it (no API key)

GET https://api.agentdatahub.de/api/v1/call/isbn-10-13-validator-converter?isbn=0-306-40615-2&compact=1

Full metadata: without compact=1 · Markdown: format=llm · Only some fields: add &fields=a,b.c · MCP: tool call_api with {"apiId":"isbn-10-13-validator-converter"}

Parameters

Example response (live, compact)

{
  "apiId": "isbn-10-13-validator-converter",
  "data_freshness": "cached",
  "data": {
    "input": "0-306-40615-2",
    "normalized": "0306406152",
    "format": "ISBN-10",
    "is_valid_checksum": true,
    "isbn_13": "9780306406157"
  },
  "source": "100% Platform Deterministic Compute / Reference Engine",
  "license": "100% Platform Local Math"
}

Source & license