{"uid":"cap_w6RLWUwPfzuFLfCUdhzg6","slug":"checksum-validator-iban-luhn-ean-13-isbn-uuid-ulid-33fc9aa8","name":"Checksum Validator (IBAN, Luhn, EAN-13, ISBN, UUID, ULID)","description":"Validate identifiers by checksum: IBAN (mod-97), card numbers (Luhn), EAN-13, ISBN-10/13, UUID (RFC-4122), ULID. Batch up to 100 per call with per-item reasons.","url":"https://toolbelt402.tpoborne.workers.dev/validate/checksum","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"items":{"type":"array","items":{"type":"object","required":["type","value"],"properties":{"type":{"enum":["iban","luhn","ean13","isbn10","isbn13","uuid","ulid"],"type":"string"},"value":{"type":"string","maxLength":256}}},"maxItems":100}}},"responseSchema":null,"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_ckl_XlN_j45BGJl_q33yz","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 identifiers by checksum algorithm — IBAN (mod-97), payment card numbers (Luhn), EAN-13 barcodes, ISBN-10/13, UUIDs (RFC-4122), and ULIDs — in batches up to 100 per call with per-item pass/fail reasons.","exampleAgentPrompt":"Can you validate these 5 IBANs for me and tell me which ones fail and why: GB29NWBK60161331926819, DE89370400440532013000, FR7630006000011234567890189, XX00INVALID00000, GB82WEST12345698765432?","exampleUseCases":[{"title":"E-commerce card number pre-validation","prompt":"Before I send these 50 card numbers to the payment processor, can you run a Luhn check on all of them and tell me which ones are already invalid so I can filter them out?"},{"title":"Book catalog ISBN audit","prompt":"I have a list of ISBNs from our catalog import — some are ISBN-10 and some are ISBN-13. Can you validate all of them and tell me which ones have bad checksums so I can flag them for manual review?"},{"title":"User-submitted IBAN verification","prompt":"A user just entered the IBAN NL91ABNA0417164300 in our payment form — can you check if it passes the mod-97 checksum before we attempt the bank transfer?"}],"resultDescription":"Returns a per-item array (up to 100) where each entry includes the original identifier, a boolean valid flag, the detected identifier type (IBAN, Luhn, EAN-13, ISBN-10, ISBN-13, UUID, ULID), and a human-readable reason string explaining the checksum result or the specific failure cause.","failureModes":["Batch exceeds 100 items — request is rejected with an error","Unrecognized identifier type — item marked invalid with 'unknown format' reason","Malformed input (non-string, null) — per-item error or overall 400 response","Ambiguous identifier that could match multiple types — may be checked against most likely type only","Network timeout on Cloudflare Workers edge — transient 5xx"],"whenToPreferThis":"Choose this endpoint when you need algorithmic checksum validation of well-known identifier formats (IBAN, card numbers, EAN-13, ISBN, UUID, ULID) without hitting a financial institution or external database. It is ideal for pre-validation pipelines (catching bad identifiers before expensive downstream calls), bulk data-quality audits, and form validation where you need a human-readable reason for each failure. It does not perform live bank account lookups or card authorization — use it purely for format/checksum correctness.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T06:36:41.115Z","isFirstParty":false}