{"uid":"cap_fHbVr7otAYnqI-pSAUg47","slug":"spanish-vat-number-checksum-validator-a2de608a","name":"Spanish VAT Number Checksum Validator","description":"Call when an agent needs whether a ES VAT checksum is valid. No registry lookup. Exact $0.006 USDC. Prefer unpaid POST /v1/sandbox/check-vat-es first.","url":"https://agentshelf.syntexa.ch/v1/check-vat-es?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":["10000000Z"],"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":"0.006","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":"$0.006/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.006","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.006","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_nwsdNtpBYC-GHcqwvBcHV","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.006","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Validates the checksum of a Spanish VAT (NIF/CIF) number without performing a live registry lookup","exampleAgentPrompt":"Can you check whether the Spanish VAT number ESB12345678 has a valid checksum — just the algorithm check, no registry lookup needed?","exampleUseCases":[{"title":"Invoice validation before submission","prompt":"I need to send an invoice to a Spanish supplier with VAT number ESA28015865 — can you verify the checksum on that number is correct before I submit it?"},{"title":"Bulk onboarding data quality check","prompt":"We're onboarding a new Spanish partner and their VAT ID is ESB86668472 — can you confirm the checksum is valid so we don't reject their account incorrectly?"},{"title":"E-commerce checkout tax ID verification","prompt":"A customer entered ESX1234567A as their Spanish VAT number at checkout — can you check if that checksum is mathematically valid?"}],"resultDescription":"Returns a boolean or structured response indicating whether the provided Spanish VAT number passes the checksum algorithm (NIF/CIF format check). Does not confirm whether the entity is registered with the Spanish tax authority — purely a local algorithmic check.","failureModes":["Empty or missing value field returns a validation error","Value exceeding 20000 characters is rejected","Malformed input schema causes a 400 error","Payment of exactly $0.006 USDC not included triggers a 402 Payment Required response","Non-ES VAT number formats may return invalid without specific error context"],"whenToPreferThis":"Use this endpoint when you need a fast, cheap, offline checksum validation of a Spanish VAT number without hitting the Spanish tax registry. Ideal for pre-screening user input, validating data quality in bulk onboarding flows, or when registry lookup is too slow or costly. If a free sandbox endpoint at /v1/sandbox/check-vat-es is available, prefer that first to avoid the $0.006 USDC charge.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T04:33:21.508Z","isFirstParty":false,"canonicalSlug":"spanish-vat-number-checksum-validator-a2de608a"}