{"uid":"cap_rclJQ1UMrfD3UsrSNRisn","slug":"delx-isbn-check-3ca6380e","name":"Delx ISBN Check","description":"ISBN-10/ISBN-13 checksum validation for $0.001 USDC. Call when you need this bounded result without an API key or subscription. Returns machine-readable JSON via x402 on Base or Solana. Limitation: results cover only the supplied input or one bounded public endpoint at request time; callers must verify before acting.","url":"https://api.delx.ai/api/v1/x402/isbn-check?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input","output"],"properties":{"input":{"type":"object","required":["type","bodyType","body"],"properties":{"body":{"type":"object","additionalProperties":true},"type":{"type":"string","const":"http"},"method":{"enum":["POST","PUT","PATCH"],"type":"string"},"bodyType":{"enum":["json","form-data","text"],"type":"string"}},"additionalProperties":false},"output":{"type":"object","required":["type","example"],"properties":{"type":{"type":"string","const":"json"},"example":{"type":"object","additionalProperties":true}}}}},"responseSchema":{"type":"json","example":{}},"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_ROD33fvaNPCE9EyYX0flX","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 ISBN-10 and ISBN-13 checksum correctness for a given ISBN string","exampleAgentPrompt":"Can you check whether 978-3-16-148410-0 is a valid ISBN-13 with a correct checksum?","exampleUseCases":[{"title":"Pre-catalog ISBN sanity check","prompt":"Before I add this book to my store catalog, can you verify that the ISBN 0-306-40615-2 has a valid checksum?"},{"title":"Bulk data cleaning validation","prompt":"I have an ISBN that came from a user entry — 9780141036144 — can you check if it's a properly formed ISBN-13 with the right check digit?"},{"title":"Publisher data integrity check","prompt":"We received a manuscript submission with ISBN 978-0-7432-7356-5 — validate that the checksum is correct before we register it."}],"resultDescription":"Returns whether the provided ISBN string passes checksum validation, along with the detected format (ISBN-10 or ISBN-13) and the validation outcome (valid/invalid).","failureModes":["Invalid or missing ISBN input returns a validation error","Non-numeric or malformed ISBN string (wrong length, unexpected characters) returns invalid result","Network timeout or service unavailability","Payment failure via x402 protocol preventing the call"],"whenToPreferThis":"Use this endpoint when you need a lightweight, programmatic checksum validation of an ISBN-10 or ISBN-13 identifier before storing, querying, or displaying it — especially in automated catalog pipelines, user-input sanitization flows, or data quality checks where calling a full book metadata API would be overkill.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-11T00:47:01.069Z","isFirstParty":false,"canonicalSlug":"delx-isbn-check-3ca6380e"}