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EU VAT Validation API Comparison
Several APIs validate EU VAT numbers via VIES. The differences are in caching architecture, pricing tiers, developer experience, and what happens when VIES goes down. This page maps out where TaxID sits relative to the main alternatives — with honest assessments of when each competitor is the right choice.
TaxID is our product. Every comparison below is written by us and links to the competitor's pricing and documentation so you can verify claims independently.
TaxID at a glance
Free tier
100 req/mo
No credit card
Max paid scale
1,000,000 req/mo
Custom plans available
Cached response
< 10ms
Upstash Redis, 24h TTL
Countries covered
27 EU members
All VIES-supported states
Auth
Bearer token
Standard HTTP Authorization
HTTPS
All plans
Including free tier
TaxID vs competitors
Vatstack
Starting at $9/mo · vatstack.com ↗
Vatstack is a well-documented EU VAT validation API — probably the most developer-friendly option before TaxID existed. If you're evaluating Vatstack today, the two questions most …
Vatstack strengths
- + Clean REST API with good documentation
- + Webhook support for asynchronous validation
- + Tax rate lookups included
Vatstack limitations
- − Free tier limited to 20 requests/month
- − No SLA guarantee on free/starter plans
- − VIES service unavailability not transparently communicated
Vatlayer
Starting at $9.99/mo · vatlayer.com ↗
Vatlayer is one of the longest-running EU VAT validation APIs — it's referenced in countless tutorials from 2015–2020 and shows up in many Stack Overflow answers. If you're on Vatl…
Vatlayer strengths
- + Long-established service (since 2014)
- + Includes VAT rate lookups for all EU countries
- + Simple REST API with JSON responses
Vatlayer limitations
- − HTTPS only available on paid plans
- − No batch validation
- − Response times 500ms+ during peak hours
VATCheck API
Starting at $19/mo · vatcheckapi.com ↗
VATCheck API is the go-to option if you want maximum headroom before paying anything — 500 free validations per month is the highest free tier in the EU VAT API market. If you're b…
VATCheck API strengths
- + Generous free tier (500 requests/month)
- + Clean modern API design
- + Includes request timestamp and correlation IDs
VATCheck API limitations
- − No webhooks
- − No batch validation
- − No VAT rate data
LookupTax
Starting at $29/mo · lookuptax.com ↗
LookupTax is built for companies that validate tax IDs globally — US EINs, Brazilian CNPJs, Australian ABNs, and EU VAT in one API. If that's your use case, it's a strong product. …
LookupTax strengths
- + Global tax ID validation (not just EU)
- + Webhooks and event streaming
- + Batch validation API
LookupTax limitations
- − Higher price point than EU-only alternatives
- − Overkill if you only need EU VAT validation
- − Free tier only 50 requests/month
Avalara
Starting at $500/mo · avalara.com ↗
Avalara is an enterprise tax compliance platform — it handles tax calculation, filing, and reporting for companies managing millions in tax liability. If someone recommended Avalar…
Avalara strengths
- + Enterprise-grade tax compliance platform
- + Full tax calculation, filing, and reporting
- + Deep ERP integrations (SAP, NetSuite, Salesforce)
Avalara limitations
- − No free tier — enterprise pricing only ($500+/month)
- − Complex implementation requiring professional services
- − Long sales process — no self-service signup
How to choose an EU VAT validation API
Every EU VAT validation API on this page ultimately calls the same upstream source: the EU VIES (VAT Information Exchange System) SOAP service. The differentiators are what happens around that call — caching, error handling, rate limits, and pricing.
For most developers building B2B SaaS, e-commerce checkouts, or ERP connectors, the decision comes down to three factors: (1) how many validations you need per month, (2) whether you need webhooks or batch processing, and (3) whether you only serve EU customers or need global tax ID validation.
Free tier differences matter more than they look. Vatstack's 20-request free tier is effectively a trial. VATCheckAPI's 500-request free tier is genuinely usable for low-volume internal tools. TaxID's 100-request free tier sits in between — enough for a real prototype but not a production checkout without upgrading.
Caching architecture is the real performance difference. VIES SOAP calls take 200–800ms depending on country and server load. APIs that cache validated results return in milliseconds for repeat lookups — critical for checkout UX. TaxID caches active VAT numbers for 24 hours in Upstash Redis and returns sub-10ms for cached requests.
VIES downtime handling separates good APIs from bad ones. VIES has scheduled and unscheduled maintenance windows. An API that hard-fails when VIES is down will block your checkout for real customers with valid VAT numbers. Look for explicit service_unavailable error handling with guidance on retry/allow behavior.
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100 free validations/month. No credit card. Working API in two minutes.