{"uid":"cap_QtUSwTH6_yXlSCEOR0_gb","slug":"api-strale-io-fe08b024","name":"ISBN Validator & Converter","description":"Validate an ISBN-10 or ISBN-13 number. Checks format, length, and checksum. Converts ISBN-10 to ISBN-13. Pure algorithmic — instant.","url":"https://api.strale.io/x402/isbn-validate?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","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","required":["isbn"],"properties":{"isbn":{"type":"string","description":"ISBN-10 or ISBN-13 (e.g. 978-3-16-148410-0)"}}}},"additionalProperties":false}}},"responseSchema":null,"example":{"request":{"isbn":"978-3-16-148410-0"},"response":{"type":"ISBN-13","_meta":{"payment":{"method":"x402","price_usd":0.0216,"settlement_id":"0xdc4dc99a98bd25465ab421f4dc1857d667bcd628d84959041ab32cd1e2abf0bc"},"capability":"isbn-validate","latency_ms":0,"provenance":{"source":"algorithmic","fetched_at":"2026-06-13T04:24:21.666Z"}},"valid":true,"isbn13":"9783161484100","ean_prefix":"978","isbn_input":"978-3-16-148410-0","isbn_cleaned":"9783161484100"}},"exampleRequest":{"isbn":"978-3-16-148410-0"},"tags":["x402"],"displayCostAmount":"0.0216","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"settled","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":"$0.0216/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.0216","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.0216","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_wA4Ow36JloBj5pKIyUKdU","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.0216","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Validates ISBN-10 or ISBN-13 numbers by checking format, length, and checksum, and converts ISBN-10 to ISBN-13","exampleAgentPrompt":"Can you check if '978-3-16-148410-0' is a valid ISBN-13, and also tell me if it converts correctly from ISBN-10?","exampleUseCases":null,"resultDescription":"Returns whether the ISBN is valid, the result of format/length/checksum checks, and the ISBN-13 equivalent if an ISBN-10 was provided.","failureModes":["Missing isbn query parameter returns error","Malformed ISBN with non-numeric characters may fail parsing","ISBN with wrong length returns format/length validation failure","Invalid checksum returns checksum error with details","Payment not provided or invalid returns 402 Payment Required"],"whenToPreferThis":"Use this endpoint when you need instant, algorithmic ISBN validation without any external database lookup — ideal for validating user-submitted book ISBNs, cleaning publisher data, or converting between ISBN-10 and ISBN-13 formats at scale.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-11T18:42:20.175Z","isFirstParty":false,"canonicalSlug":"api-strale-io-fe08b024"}