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Measured on six things

Fast EU VAT validation API for developers, covering 27 EU...

Accessibility

Lighthouse accessibility 92/100 but with contrast and color-reliance issues. No WCAG statement or dedicated accessibility page. Responsive and keyboard-navigable.

Screenshots

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TaxID

About this app

TaxID is a developer-focused VAT validation API that simplifies checking EU VAT numbers against the official VIES system. It covers all 27 EU member states, plus the UK, Norway, Switzerland, and Australia, with a single REST endpoint. The API returns company name, address, and validation status in JSON. Key features include sub-10ms cached responses for previously validated numbers, structured error codes with Stripe-style naming, local format validation before hitting VIES to save quota, and a free tier that offers 100 validations per month with no credit card required. Ideal for automating B2B compliance, checkout VAT checks, and invoice validation, TaxID is built for developers who need reliability, speed, and ease of integration, avoiding the SOAP complexities and downtime issues of direct VIES access.

Key features

1Single REST endpoint for VAT validation across 31 countries (EU, UK, NO, CH, AU)
2Sub-10ms cached responses for previously validated numbers (24h cache)
3Structured error codes (Stripe-style) distinguishing invalid vs. service_unavailable
4Free tier with 100 validations/month, no credit card required
5Company name and address returned with each validation
6Local format validation before hitting VIES to save quota

Target customer profile

Drawn from the product itself, not from a survey.

Demographic

SaaS developers and startups handling EU B2B sales

Pain points

Need to comply with EU VAT rules but lack time for complex SOAP integrations; VIES can be slow and unreliable, causing delays or failed validations.

Primary needs

A fast, reliable, and easy-to-integrate VAT validation API that supports all EU countries and returns clear, structured data.

Demographic

E-commerce businesses and payment services (e.g., Stripe users)

Pain points

Need to validate VAT numbers at checkout to apply correct tax treatment; existing solutions may be expensive or offer limited free tiers.

Primary needs

Cost-effective, sub-10ms validation with caching, and support for multiple countries to ensure smooth international transactions.

Demographic

Accountants and fintech platforms managing invoices for clients

Pain points

Manual VAT verification is tedious and error-prone; need to automate checks for thousands of invoices while ensuring data accuracy.

Primary needs

An API that provides company name and address with each validation, integrates easily into existing accounting systems, and scales without breaking the bank.

Scout Review

Written by AI from measured evidence, scored out of 100.

TaxID is a well-executed, developer-focused VAT validation API that wraps the notoriously painful VIES system into a clean REST/JSON interface. The landing page is polished, the docs are excellent, and the free tier is generous. Performance is a clear strength with a 97/100 Lighthouse score and sub-10ms cached response claims. Security is solid with strong HTTP headers, though missing SPF/DMARC and formal certifications leave room for improvement. Accessibility is good but has contrast issues. The growth potential is real given the clear wedge and target market, but the product is young and faces competition. Overall, a promising tool that delivers on its promise of simplicity and speed, with a few areas to tighten for enterprise adoption.

Measure by measure

Usability

Excellent onboarding: curl example on homepage, clear docs with country-specific examples, and integration guides. Pricing page even tells you when NOT to use it — refreshing honesty.

Design

Clean, developer-focused design with strong typographic hierarchy and early code snippet. Minor issues: cramped stats row and duplicate maker image.

Speed

Lighthouse mobile performance 97/100 with LCP 2.1s and CLS 0. Site claims sub-10ms cached responses and p95=40ms; no independent benchmarks but no complaints found.

Security

Strong HTTP security headers (10/13 checklist) with HSTS, CSP, and frame protection. Missing secure cookies, SPF, DMARC. No SOC 2 or pen-test report published.

Accessibility

Lighthouse accessibility 92/100 but with contrast and color-reliance issues. No WCAG statement or dedicated accessibility page. Responsive and keyboard-navigable.

Growth

Clear wedge: REST/JSON over VIES with caching and structured errors. Targets developers and e-commerce; category has headroom but competition is real.

Improvement areas

No public status page or uptime history to verify reliability claims
Missing SPF and DMARC records for email authentication
No SOC 2, ISO, or pen-test report published for enterprise trust
Accessibility issues: contrast ratios and color-dependent links
CH and AU endpoints currently return service_unavailable, limiting country coverage

Design & Usability

TaxID presents a clean, developer-first design with a strong hero that immediately communicates value: 'EU VAT Number Validation API' in heavy black with a blue 'built for developers' accent. The quickstart section with a curl example and JSON response is a masterstroke for the target audience — no scrolling required to see integration. Feature cards are well-structured with clear headings and consistent padding, though the stats row feels slightly cramped and the maker media image duplicates the hero. Usability is excellent: the docs are thorough with country-specific examples, error handling guidance, and even a 'WHEN YOU DON'T NEED TAXID' section that builds trust. The free tier with 100 validations and no credit card lowers the barrier to entry. Integration guides for Node.js, Python, React, and B2B scenarios cover common use cases. The pricing page is transparent with a clear comparison to direct VIES costs. Overall, a well-executed landing and docs experience that respects the developer's time.

Speed & Security

Performance is a standout: Lighthouse mobile performance scores 97/100 with LCP at 2.1s and zero layout shift. The site is snappy and lightweight, which aligns with the API's promise of sub-10ms cached responses. While no independent benchmarks are available, the technical claims are plausible given the Redis caching strategy. Security is solid but not exceptional: the HTTP probe shows strong headers including HSTS, CSP, and frame protection, scoring 10/13 on the checklist. However, secure cookies are not set, and SPF/DMARC records are missing, which could be a concern for email-based communications. There's no published SOC 2 or ISO certification, which is common for early-stage products but worth noting for enterprise adoption. The API itself handles sensitive business data, so the lack of a formal security page or bug bounty program is a gap. Overall, speed is a clear strength, while security is adequate but has room for improvement in email authentication and formal certifications.

Accessibility & Growth

Accessibility is decent but not perfect: Lighthouse scores 92/100, but the audit flags insufficient contrast ratios and links that rely solely on color. These are fixable issues that could exclude users with visual impairments. There's no WCAG statement or dedicated accessibility page, which is a missed opportunity for a developer tool that should lead by example. Growth potential is promising: the problem is real — VIES is SOAP-based, unreliable, and lacks caching. TaxID's wedge is clear: REST/JSON, sub-10ms cached responses, structured errors, and a generous free tier. The target customer is well-defined (SaaS developers, e-commerce, fintech). However, the category has competition from Vatstack and Avalara, and the domain is only 0.3 years old with no visible traction. The idea has headroom, especially with the 'invalid vs. service_unavailable' distinction that prevents blocking valid customers during VIES outages. The main risk is execution and building trust in a market where reliability is paramount.

Conclusion

TaxID is a breath of fresh air in the VAT validation space — it takes a painful, SOAP-laden process and makes it feel like a modern API should. The free tier is a smart hook, and the docs are a model of clarity. If the team can add formal security certifications, fix the accessibility nits, and build a track record of uptime, this could become the go-to for EU VAT validation. For now, it's a solid choice for developers who value their time and sanity. Give it a try — your future self will thank you when you're not parsing XML at 2am.

Suggestions for improvement

Add a public status page to showcase uptime and real-time performance metrics
Publish a security page with SOC 2 or ISO 27001 roadmap and bug bounty program
Fix contrast ratios and ensure links are distinguishable beyond color for WCAG compliance
Add more integration examples for popular frameworks like Laravel or Go

How we score

Alternatives comparison

Named competitors, point by point. Nobody paid to appear here or to be left out.

	TaxID	Avalara	Vatstack	VIES (direct)
Free tier validations per month	100	Not specified (enterprise, sales-led)	20	Unlimited (free, but no SLA)
API style	REST/JSON	REST/SOAP (enterprise)	REST/JSON	SOAP/XML
Caching for repeat lookups	Yes, sub-10ms cached for 24h	Not specified	Not specified	No caching
Error handling	Structured codes (invalid vs. service_unavailable)	Enterprise-grade, but complex	Standard error codes	Ambiguous faults (same code for invalid and downtime)
Country coverage	31 countries (EU+UK, NO, CH, AU)	Global tax compliance	EU + UK (likely)	EU member states only

Avalara

A comprehensive tax compliance platform for enterprise, but it's heavier and requires a sales call; TaxID is a lean, developer-friendly alternative.

Vatstack

Offers VAT validation but with a more limited free tier (20/month); TaxID provides 100 free validations and better scalability.

VIES (direct)

The official EU VAT Information Exchange System; it's SOAP-based with no caching and frequent downtime, whereas TaxID wraps it with RESTful JSON and caching.

Comparing options? See TaxID alternatives, scored side by side

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