{"uid":"cap_-jG941WUJfTPTe-9Es018","slug":"delx-commerce-isbn-check-api-7db33a92","name":"Delx Commerce ISBN Check API","description":"Pay-per-result APIs for agents. No signup. Exact price. Verifiable delivery. USDC on Base + Solana via x402.","url":"https://commerce.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_uHGSA-JJahxWmVQcKdJy8","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 and looks up book metadata by ISBN number, returning bibliographic information for a given book identifier","exampleAgentPrompt":"Can you check whether ISBN 978-0-06-112008-4 is valid and tell me what book it belongs to?","exampleUseCases":[{"title":"Verify book before marketplace listing","prompt":"I'm about to list a book for sale — can you verify that ISBN 9780743273565 is real and tell me the title and author so I can confirm I have the right edition?"},{"title":"Enrich reading list with metadata","prompt":"I have an ISBN from a receipt — 9780385737951 — can you look it up and tell me the book title, author, and publisher?"},{"title":"Validate ISBN in data pipeline","prompt":"We're importing a product catalog and need to confirm ISBN 9780062315007 is a legitimate book identifier before we process it — can you check it?"}],"resultDescription":"A JSON object containing ISBN validity status and associated bibliographic metadata such as title, author, publisher, edition, and other book details if the ISBN resolves to a known record.","failureModes":["Invalid or malformed ISBN format returns an error or invalid flag","ISBN not found in database returns empty or not-found response","Network timeout on upstream bibliographic data source","Malformed request body missing required fields returns 400-level error","ISBN checksum fails validation"],"whenToPreferThis":"Choose this endpoint when you need a lightweight, pay-per-call ISBN validation and metadata lookup with no signup or subscription — ideal for agents processing individual book identifiers on-demand, enriching product catalogs, or verifying book data before purchase or listing, especially when USDC micropayment billing via x402 is already integrated.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-01T00:53:39.730Z","isFirstParty":false,"canonicalSlug":"delx-commerce-isbn-check-api-7db33a92"}