{"uid":"cap_fsJ3XKlVXxy_5C9hhUa-M","slug":"isbn-check-digit-validator-converter-0effacdb","name":"ISBN Check Digit Validator & Converter","description":"Validate an ISBN-10 or ISBN-13 check digit and convert between the two forms.","url":"https://id-validators.x402tookit.com/isbn-check?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["id"],"properties":{"id":{"type":"string","description":"The ISBN"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"asOf":{"type":["null","string"]},"form":{"type":["null","string"]},"isbn10":{"type":["null","string"]},"prefix":{"type":["null","string"]},"source":{"type":["null","string"]},"reasons":{"type":["array","null"],"items":{"type":"string"}},"summary":{"type":["null","string"]},"verdict":{"type":["null","string"]},"degraded":{"type":["boolean","null"]},"disclaimer":{"type":["null","string"]},"normalised":{"type":["null","string"]},"notChecked":{"type":["array","null"],"items":{"type":"string"}}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_jZMxZkYz8uU8UchPchS_O","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Validates the check digit of an ISBN-10 or ISBN-13 and converts between the two forms.","exampleAgentPrompt":"Can you check whether the ISBN 978-0-306-40615-7 is valid and tell me its ISBN-10 equivalent?","exampleUseCases":[{"title":"Validate ISBN before book listing","prompt":"Before I add this book to our catalog, can you verify that the ISBN 0-306-40615-2 has a valid check digit and tell me what its ISBN-13 form would be?"},{"title":"Catch bad ISBNs in data import","prompt":"I'm importing a spreadsheet of books and one entry has ISBN 9780140449136 — can you confirm it's a valid ISBN-13 and give me the normalized form?"},{"title":"Identify ISBN format in user submission","prompt":"A user submitted the identifier 0451526538 for a book — can you tell me if it's a valid ISBN, which form it is (10 or 13), and what the canonical version looks like?"}],"resultDescription":"Returns a verdict (valid/invalid), the normalized ISBN, the detected form (ISBN-10 or ISBN-13), the ISBN-10 equivalent if applicable, the publisher prefix, a human-readable summary, and an array of reasons explaining any validation failures. May also include source, asOf timestamp, degraded flag, disclaimer, and a list of checks not performed.","failureModes":["Missing or empty 'id' query parameter returns an error","Malformed input (e.g. non-numeric characters in wrong positions) results in an invalid verdict with reasons","ISBN of wrong length (not 10 or 13 digits) returns an invalid verdict","Network or service unavailability returns a non-200 response","Payment failure (x402) prevents the request from completing"],"whenToPreferThis":"Choose this endpoint when you specifically need to validate the check digit of an ISBN-10 or ISBN-13 and/or convert between the two forms. It is purpose-built for book identifiers and returns detailed per-field breakdown including prefix, form, and normalized representation — more specific than a general barcode validator. Use sibling endpoints for other identifier types (ISSN, EAN, CUSIP, etc.).","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-30T00:34:27.452Z","isFirstParty":false,"canonicalSlug":"isbn-check-digit-validator-converter-0effacdb"}