{"uid":"cap_P0-X52T0PabULGlbgwqgm","slug":"isbn-13-checksum-validator-398a4992","name":"ISBN-13 Checksum Validator","description":"Call when an agent needs whether an ISBN-13 checksum is valid. Exact $0.005 USDC. Prefer unpaid POST /v1/sandbox/check-isbn-13 first.","url":"https://agentshelf.syntexa.ch/v1/check-isbn-13?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"data":{"description":"JSON value for schema-check SKUs. Omit it on string checks such as email or IBAN."},"value":{"type":"string","examples":["9780306406157"],"maxLength":20000,"minLength":1,"description":"Value to check. The route description names the format: email, phone, IBAN, postal code, VAT, national id, or similar."},"schema":{"description":"JSON Schema document for schema-check SKUs. Omit it on string checks."}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","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":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_bR68rmci1DkscWwqS_ZdE","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","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-13 string passes its checksum (mod-10 algorithm), returning true or false.","exampleAgentPrompt":"Can you check whether 9780306406157 is a valid ISBN-13 — does its checksum digit pass?","exampleUseCases":[{"title":"Bookstore inventory data cleanup","prompt":"I'm importing a spreadsheet of book ISBNs into our inventory system — can you check whether 9780525559474 is a valid ISBN-13 before I add it?"},{"title":"User-submitted book lookup validation","prompt":"A user just entered 9781234567897 as their book's ISBN — is that a legitimate ISBN-13 or did they mistype it?"},{"title":"Publisher catalog QA pipeline","prompt":"We're auditing our catalog and need to know if 9783161484100 has a correct check digit — can you verify the ISBN-13 checksum?"}],"resultDescription":"Returns a boolean or structured response indicating whether the provided ISBN-13 string's checksum digit is mathematically valid according to the ISBN-13 mod-10 (Luhn-style) algorithm. No external network calls or LLM inference are involved — it is a pure deterministic computation.","failureModes":["Input string shorter or longer than 13 digits — may return invalid or error","Non-numeric characters in the ISBN string cause a parse error","Empty or missing value field returns a validation error","Malformed JSON request body returns HTTP 400"],"whenToPreferThis":"Use this endpoint when you need a deterministic, authoritative checksum check for an ISBN-13 and want to avoid implementing the mod-10 algorithm yourself. Prefer the free sandbox endpoint (POST /v1/sandbox/check-isbn-13) for testing or high-volume batch validation before falling back to this paid endpoint. Choose this over an LLM guess when correctness is required.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T02:16:06.739Z","isFirstParty":false,"canonicalSlug":"isbn-13-checksum-validator-398a4992"}