{"uid":"cap_X1-JBM-kFabVtpNllELyz","slug":"polish-vat-number-checksum-validator-ef26a03d","name":"Polish VAT Number Checksum Validator","description":"Call when an agent needs whether a PL VAT checksum is valid. No registry lookup. Exact $0.001 USDC. Prefer unpaid POST /v1/sandbox/check-vat-pl first.","url":"https://agentshelf.syntexa.ch/v1/check-vat-pl?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":["0000000017"],"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":"0.001","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_OUHIj2faR-UWHzidNJy1d","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 whether a Polish VAT (NIP) number has a correct checksum, without performing any registry or database lookup.","exampleAgentPrompt":"Can you check whether the Polish VAT number 1234567890 has a valid checksum — just the math, no registry lookup needed?","exampleUseCases":[{"title":"Invoice validation for Polish supplier","prompt":"Before I send this invoice, can you verify that the Polish NIP number 5260001234 passes the checksum — I just need to know if the number itself is mathematically valid."},{"title":"Batch supplier onboarding form check","prompt":"We're onboarding a new vendor from Poland and they gave us NIP 7740001454 — can you quickly check if the checksum on that number is correct?"},{"title":"E-commerce checkout VAT field validation","prompt":"A customer entered 9462593789 as their Polish VAT number at checkout — does that pass the NIP checksum validation?"}],"resultDescription":"Returns a boolean or equivalent result indicating whether the submitted Polish VAT (NIP) number satisfies the official checksum algorithm, with no external registry or government database consulted.","failureModes":["Input string is empty or missing — returns validation error","Input exceeds 20000 character limit — rejected by schema","Non-numeric or improperly formatted string may return invalid checksum result rather than an error","Payment of exactly $0.001 USDC not provided — x402 payment required error returned","Network timeout or service unavailability — HTTP 5xx error"],"whenToPreferThis":"Choose this endpoint when you need a fast, cheap, purely algorithmic checksum check on a Polish NIP/VAT number and do not need to confirm the number is actually registered with the Polish tax authority. Ideal for pre-validation of user input before making more expensive registry API calls, or when registry access is unavailable or unnecessary.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T06:30:58.703Z","isFirstParty":false,"canonicalSlug":"polish-vat-number-checksum-validator-ef26a03d"}