{"uid":"cap_By1Lz9h3Ur0YEBtyfGS_G","slug":"dk-vat-number-checksum-validator-6d8d6587","name":"DK VAT Number Checksum Validator","description":"Call when an agent needs whether a DK VAT checksum is valid. No registry lookup. Exact $0.003 USDC. Prefer unpaid POST /v1/sandbox/check-vat-dk first.","url":"https://agentshelf.syntexa.ch/v1/check-vat-dk?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":["00000019"],"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":"0.003","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":"$0.003/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_AOg0QsJBLVh0Pw1ARRSq5","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.003","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Validates whether a Danish VAT (CVR) number passes the DK checksum algorithm, without performing a live registry lookup.","exampleAgentPrompt":"Check whether the Danish VAT number 12345678 has a valid DK checksum — just the algorithm check, no registry lookup needed.","exampleUseCases":[{"title":"E-commerce checkout VAT validation","prompt":"Before we process this Danish business customer's order, can you verify that their VAT number 29876543 passes the DK checksum? We just need to know if it's structurally valid, not a full registry check."},{"title":"B2B invoice data quality check","prompt":"I have a list of Danish supplier VAT numbers I need to clean up — can you check if 55133018 is a valid DK VAT number by checksum so I can flag bad entries before importing them?"},{"title":"Onboarding form real-time validation","prompt":"A new Danish business partner entered 87654321 as their CVR number during signup — can you run the DK VAT checksum on it to tell me if the format is mathematically valid?"}],"resultDescription":"Returns a boolean or structured result indicating whether the provided Danish VAT (CVR) number passes the DK modulus-11 checksum algorithm. No live registry or government database is queried — this is a purely computational, offline validation.","failureModes":["Empty or missing value field returns an error","Value exceeding 20000 characters rejected","Malformed JSON body returns 400","Non-numeric or incorrectly formatted VAT strings may return invalid rather than an error","x402 payment not provided or insufficient results in 402 Payment Required"],"whenToPreferThis":"Choose this endpoint when you need a fast, low-cost, offline checksum validation of a Danish VAT/CVR number and do not need to confirm the number is actively registered in the Danish business registry. Ideal for form validation, data cleaning, and pre-filtering before more expensive registry lookups. Use the free sandbox endpoint (/v1/sandbox/check-vat-dk) first if available.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T06:50:03.571Z","isFirstParty":false,"canonicalSlug":"dk-vat-number-checksum-validator-6d8d6587"}