{"uid":"cap_JwDhFCn0jIB_MkJvJg0bB","slug":"portuguese-vat-number-checksum-validator-8bbcc8f2","name":"Portuguese VAT Number Checksum Validator","description":"Call when an agent needs whether a PT VAT checksum is valid. No registry lookup. Exact $0.007 USDC. Prefer unpaid POST /v1/sandbox/check-vat-pt first.","url":"https://agentshelf.syntexa.ch/v1/check-vat-pt?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":["000000019"],"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":"0.007","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":"$0.007/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.007","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.007","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_F50lJrb0maPI1UqYQxYYC","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.007","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 Portuguese (PT) VAT number without performing a live registry lookup","exampleAgentPrompt":"Can you check whether the Portuguese VAT number 545259045 has a valid checksum — just the math, no registry lookup needed?","exampleUseCases":[{"title":"E-commerce PT customer tax ID check","prompt":"Before I save this customer's billing info, can you verify that the Portuguese NIF 501964843 is mathematically valid?"},{"title":"B2B invoice validation workflow","prompt":"I'm about to issue an invoice to a Portuguese company and I want to make sure their VAT number 500168361 passes the checksum test — can you confirm?"},{"title":"Bulk onboarding form validation","prompt":"A user entered 123456789 as their Portuguese NIF during signup — does that number have a valid PT VAT checksum?"}],"resultDescription":"Returns whether the provided Portuguese VAT number string passes the mod-based checksum algorithm used for PT NIFs/NIF numbers, indicating structural validity without contacting any government registry.","failureModes":["Input VAT string is empty or exceeds 20000 characters — rejected by schema validation","Non-numeric or improperly formatted string may return invalid result rather than an error","Service unavailable returns HTTP 5xx","Payment not received or x402 payment protocol issue results in 402 response before processing"],"whenToPreferThis":"Use this endpoint when you need a fast, cheap ($0.007 USDC) offline checksum validation of a Portuguese VAT/NIF number and do not need to confirm whether the number is actually registered with the Portuguese tax authority. Prefer the free sandbox endpoint POST /v1/sandbox/check-vat-pt for testing. Do not use this if you need live registry confirmation of the taxpayer's existence or status.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T04:33:24.447Z","isFirstParty":false,"canonicalSlug":"portuguese-vat-number-checksum-validator-8bbcc8f2"}