Stanza VAT Validator (C#)
.NET client for a hosted EU and UK VAT number validator and rate lookup.
What it does
.NET client that sends a VAT number to a hosted API and returns JSON with whether it is valid, the country code and the standard and reduced rates for the EU-27 and the UK. Installed from NuGet; needs a Stanza API key and the hosted service, on .NET Standard 2.0 or .NET 6 and later. The README calls the checksum validation offline, but the quickstart calls the hosted API; the client is MIT.
Where it fits on the map
Not on the map: needs a paid service.
The map places maintained projects for a company tax department or a tax authority, without a demo or paid-service flag. Everything else stays on the list with its label.
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Of the same kind, for a shared jurisdiction or tax area. Not a ranking.
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Maintain this project?
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[](https://tax-oss.com/projects/stanza-vat-validator/)