TaxID provides a developer-first API for validating VAT numbers against live registries in 31 countries: all 27 EU member states through VIES, plus UK, Switzerland, Norway, and Australia.

Each validation returns the company name, address, and validation status in JSON. The API caches valid numbers in Redis for 24 hours, delivering sub-10ms response times on repeat lookups. Format validation happens locally before hitting VIES to avoid quota waste.

Free plan includes 100 validations per month with no credit card required. Paid plans start at $19/month for 1,000 validations.