AgentsToolsHub EU VAT Validator (VIES)

Use this endpoint when you need live, authoritative VIES verification of an EU VAT number — particularly for B2B invoicing workflows requiring reverse-charge validation, supplier onboarding due diligence, or accounts payable compliance checks. Prefer this over static VAT format checkers when you need real-time registry confirmation including the registered business name and address, not just format validation.

• VAT number format is invalid or malformed — returns error before querying VIES
• VIES service is temporarily unavailable — returns service unavailability error
• VAT number is structurally valid but not found in the registry — returns invalid/not registered status
• Member state registry is offline — VIES may return partial or unavailable response for that country
• Missing vatNumber query parameter — returns 400-level validation error