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EU VAT Number Batch Validation (VIES)

Batch-validate EU VAT numbers against the official VIES service, with seller-side retry, caching, and rate-limit absorption. Buyer submits up to 1000 VAT numbers per call with a freshness preference. Seller handles VIES quirks: slow responses, per-country downtime, bulk-call throttling, and retry logic. Results include company name and address where VIES returns them. SLA: batch of 1,000 returned within 5 min. Why agents buy this: any B2B agent transacting across the EU hits VIES eventually. The official service is slow, frequently down, per-country unreliable, and allergic to bulk calls. A seller caching and load-balancing across queries removes a structural pain point.