{"uid":"cap_DOI8qOJQ1RI0gImOHlGKJ","slug":"isbn-checksum-validator-785225ba","name":"ISBN Checksum Validator","description":"Validate an ISBN-10 or ISBN-13 checksum (hyphens/spaces ignored) and report which format it is.","url":"https://agent402.tools/api/isbn-validate","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"isbn":{"type":"string"}}},"responseSchema":{"type":"json","example":{"valid":true,"format":"ISBN-13"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","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":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_Id7ibFIm_4L0Xv0_9lFNS","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Validates an ISBN-10 or ISBN-13 checksum and identifies which format the given ISBN belongs to.","exampleAgentPrompt":"Can you check if 978-3-16-148410-0 is a valid ISBN and tell me whether it's ISBN-10 or ISBN-13?","exampleUseCases":null,"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T19:14:03.138Z","isFirstParty":false}