{"uid":"cap_ym1kz-1DeZtVwNrOW3mQE","slug":"austrian-firmenbuchnummer-fn-validator-bf2f0ebb","name":"Austrian Firmenbuchnummer (FN) Validator","description":"Offline validator for an Austrian Firmenbuchnummer (FN), the company register number. Normalizes the numeric part (1-6 digits, left-padded to 6 for calculation), computes the modulo-11 check letter using weights 2,1,2,1,2,1 (Luhn-style digit reduction for products >=9 by subtracting 9) and the standard letter table (0=p,1=a,2=b,3=c,4=d,5=e,6=f,7=g,8=h,9=i,10=k), and compares it to the supplied check letter.","url":"https://toll402.dev/v1/t/fn_at_validate","method":"POST","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method","bodyType","body"],"properties":{"body":{"type":"object","required":["value"],"properties":{"value":{"type":"string","description":"Firmenbuchnummer, e.g. 'FN 123456k' or '123456k'"}},"additionalProperties":false},"type":{"type":"string","const":"http"},"method":{"enum":["POST"],"type":"string"},"bodyType":{"enum":["json","form-data","text"],"type":"string"}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"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_BlUMWdXkdyz99WBtrhy2D","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 and verifies an Austrian Firmenbuchnummer (company register number) by computing and comparing its modulo-11 check letter offline.","exampleAgentPrompt":"Can you check if 'FN 123456k' is a valid Austrian Firmenbuchnummer — just confirm whether the check letter is correct?","exampleUseCases":[{"title":"KYB onboarding company number check","prompt":"We're onboarding an Austrian supplier and they gave us their company register number FN 98765a — can you verify that this Firmenbuchnummer is actually valid before we proceed?"},{"title":"Data quality audit of company registry","prompt":"I have a spreadsheet of Austrian company numbers and I want to flag any with invalid check letters — start by validating this one: FN 45678b."},{"title":"Form input validation before submission","prompt":"A user just typed 'FN 12345x' into our registration form — is that a valid Austrian Firmenbuchnummer, or should we show them an error?"}],"resultDescription":"A validation response indicating whether the supplied Austrian Firmenbuchnummer has a correct modulo-11 check letter, based on offline computation without any external registry lookup.","failureModes":["Invalid or missing 'value' field returns an error response","FN number with non-numeric body or unsupported format may fail to parse","Check letter not in the expected letter table (p,a,b,c,d,e,f,g,h,i,k) causes validation failure","Network or payment (x402) issues may prevent the call from completing"],"whenToPreferThis":"Use this endpoint when you need a fast, cheap, offline structural check of an Austrian Firmenbuchnummer — ideal for form validation, KYB pipelines, or data quality audits where you don't need a live registry lookup, just a check-digit verification.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T18:50:53.225Z","isFirstParty":false}