{"uid":"cap_W-caH_WM0KAAt0BBGD9M1","slug":"x402-toolbox-isbn-validator-4c5d6c78","name":"x402-toolbox ISBN Validator","description":"309 deterministic pay-per-call tools for AI agents over x402 (USDC, Base). No signup, no API key: the payment is the identity.","url":"https://x402-toolbox.shablony-pro.workers.dev/validation/isbn-validator?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"schema":{"type":"string"}}},"responseSchema":{"type":"json","example":{"ok":true,"paid":true}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","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":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_If4sIGYLb2ygm_2JUqQia","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Validates whether a given ISBN (International Standard Book Number) string is correctly formatted and legitimate","exampleAgentPrompt":"Can you check whether '978-3-16-148410-0' is a valid ISBN number?","exampleUseCases":[{"title":"Bookstore inventory data check","prompt":"Before I add these books to my inventory system, can you validate that this ISBN '0-306-40615-2' is correctly formatted and valid?"},{"title":"Publisher metadata QA pipeline","prompt":"We're importing a catalog of book records — can you verify that ISBN '9780743273565' is a legitimate, well-formed ISBN before we commit it to the database?"},{"title":"User-submitted book entry validation","prompt":"A user just entered '978-0-13-110362-7' as the ISBN for their book listing — can you confirm whether that's a valid ISBN so we can accept or reject their submission?"}],"resultDescription":"Returns a JSON object with an 'ok' boolean indicating whether the endpoint call succeeded and a 'paid' boolean confirming the x402 micropayment was processed, along with the ISBN validation result indicating whether the provided ISBN is correctly formatted and passes checksum verification.","failureModes":["Invalid or missing schema/ISBN input returns an error or ok:false","Malformed ISBN that fails checksum returns validation failure","Payment failure via x402 protocol results in unpaid/unauthorized response","Ambiguous input format (missing hyphens, wrong length) may yield false negatives"],"whenToPreferThis":"Choose this endpoint when you need a lightweight, no-signup, pay-per-call ISBN validation without managing API keys or accounts. Ideal for AI agents performing one-off or low-volume book identifier checks where the x402 micropayment model fits — especially in automated pipelines ingesting bibliographic data where ISBN integrity must be confirmed cheaply and programmatically.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T06:44:13.483Z","isFirstParty":false,"canonicalSlug":"x402-toolbox-isbn-validator-4c5d6c78"}