VAT Validation API Comparison (2026)

If you need to validate EU VAT numbers via a REST API, you have several options. They all query the same underlying data sources (VIES for the EU, HMRC for the UK), but differ significantly in developer experience, pricing, reliability, SDK support, and non-EU coverage. This comparison covers Avatcado, VATstack, vatlayer, VATsense, vatapi.com, APIStax, and taxid.dev, verified as of August 2026.

Comparison table

Note on the "Paid from" row: Avatcado's €39/mo is the monthly-billing rate for the Pro tier, shown here on the same monthly basis as every other competitor's price in this table. Avatcado also offers annual billing at €29/mo (€348/year) for the same Pro tier, and €99/mo (€1,188/year) for Business, billed annually. Every other vendor's price above is that vendor's own list price as published; check each vendor's site for whether they also offer an annual discount.

Avatcado

Avatcado is a VAT validation API built for developers. It validates against all 27 EU member states plus Northern Ireland (via VIES), the UK (via HMRC), Switzerland and Liechtenstein (via BFS UID Register), Norway (via Bronnoysund Register), and Australia (via ABR) through a single endpoint. Every response follows a consistent envelope (data / error + meta) with machine-readable error codes and a docs_url that links to the relevant error documentation.

Avatcado's standout features: a test mode with magic VAT numbers that simulate valid, invalid, and error responses without hitting live services. Built-in 25-day caching with stale fallback when VIES or HMRC is down, so your validation calls never fail due to upstream outages. Batch validation for up to 50 numbers in a single request (Pro and Business tiers). Typed SDKs for TypeScript (@avatcado/node) and Python (avatcado) with a { data, error } pattern and typed error classes. And a free, unlimited VAT rates endpoint covering all 32 supported countries.

The free tier is the most generous in the market at 500 validations per month. Pro (€39/mo, or €29/mo billed annually, 10k validations) and Business (€129/mo, or €99/mo billed annually, 50k validations) tiers unlock batch validation and higher rate limits.

The main limitation is that Avatcado is newer than some alternatives, so it has a smaller community and fewer third-party integrations. It covers EU + UK + CH + LI + NO + AU (32 countries). It doesn't offer EORI validation, invoice generation, or Stripe integration. For webhook-based async validation, see the async validation guide.

npm install @avatcado/node

import Avatcado from '@avatcado/node';

const avatcado = new Avatcado('avat_live_your_api_key');
const { data, error } = await avatcado.vat.validate({
  vatNumber: 'DE123456789',
});

if (error) {
  console.error(error.code, error.message);
} else {
  console.log(data.data.valid, data.data.company?.name);
}

pip install avatcado

from avatcado import Avatcado

avatcado = Avatcado("avat_live_your_api_key")
result = avatcado.vat.validate("DE123456789")

print(result.data.valid, result.data.company.name)

VATstack

VATstack is the most feature-rich option. Beyond validation, it offers webhooks (validation.succeeded events), Stripe auto-sync for transaction tracking, VAT OSS and EC Sales List reporting, batch validation via both the API and dashboard CSV upload, and IP geolocation. It supports EU, UK, AU, NO, SG, and CH.

VATstack has a test mode with dedicated test API keys and test VAT numbers, and provides an OpenAPI 3.0 spec on GitHub. The pricing jumps from $15/mo (500 validations) to $150/mo (15k validations) with no tier in between, which can be a pain point for growing teams. The free tier is limited to 100 validations per month.

There are no official typed SDKs, just the OpenAPI spec for client generation. Error responses include messages but not always machine-readable codes. VATstack is a good choice if you need a full VAT compliance platform with webhooks, Stripe sync, and reporting.

For a line-by-line head-to-head with Avatcado, see the VATstack alternatives page.

vatlayer

vatlayer (by APILayer) is one of the oldest VAT validation APIs. It offers validation, rate lookups, and price calculations. Pricing starts at $9.99/mo, making it one of the cheapest paid options.

The downsides are significant: no UK support (EU only, a major gap post-Brexit), no test mode, no typed SDKs, no caching, and the API uses an access key query parameter instead of bearer token authentication. Error responses are minimal. The website and documentation haven't been updated in a while. vatlayer is the cheapest option for basic EU-only validation where DX isn't a priority.

Weighing a switch? The vatlayer alternatives page compares it with Avatcado line by line.

VATsense

VATsense offers the broadest non-EU country coverage, supporting AU, NO, CH, ZA, and BR alongside the EU and UK. Avatcado now covers AU, CH, LI, and NO as well, so VATsense's unique advantage is ZA and BR. It has a free tier (100/mo) and five paid tiers from €5.99/mo to €119.99/mo, making it easy to scale without overpaying.

VATsense recently published typed SDKs in 7 languages (Python, Node.js/TypeScript, PHP, Go, Ruby, C#/.NET, Java). It also returns consultation numbers, and it returns 412 on upstream outage; failed lookups are not billed.

The API uses HTTP Basic Auth rather than bearer tokens. There's no test mode, no batch validation, no webhooks, and no OpenAPI spec. If you need broad country coverage at a granular price point, VATsense is worth evaluating.

The VATsense alternatives page has the full head-to-head with Avatcado.

vatapi.com

vatapi.com focuses on the UK market with HMRC-compliant invoice generation, sequential invoice numbering, multiple trading names per organization, and currency conversion using HMRC and ECB rates. It supports EU (VIES) and UK (HMRC) validation only.

There's no permanent free tier (30-day trial only). Pricing is sold through FastSpring checkout and not published on the site. Documentation is available via Postman collection only. There are no typed SDKs, no test mode, no batch validation, and no OpenAPI spec. vatapi.com is best if you need UK-focused invoice features alongside validation.

The vatapi.com alternatives page compares it with Avatcado in detail.

APIStax

APIStax is a multi-API platform: VAT verification sits alongside roughly a dozen unrelated APIs (HTML-to-PDF, geocoding, barcode generation, QR codes) on a shared credit pool. If you already need one of those other APIs, bundling VAT validation onto the same credits and dashboard is convenient. If you only need VAT validation, it is a secondary feature on a generalist platform rather than a purpose-built product.

Pricing runs from a one-time 100 free credits at signup through €4.99/mo (500 credits) up to €39.99/mo (10,000 credits), with credits shared across every API on the platform. It supports the EU 27, the UK, Switzerland, Norway, and Iceland (31 countries), and ships SDKs for Java, PHP, and Quarkus plus an OpenAPI spec. There is no webhook support, no batch validation, and no built-in caching layer for VAT lookups, and server errors don't consume credits.

See the APIStax alternatives page for the full comparison with Avatcado.

taxid.dev

taxid.dev is a newer, single-purpose VAT validation API: a VIES wrapper with per-tier USD pricing and Stripe-style structured error codes (vat_invalid, service_unavailable) instead of raw SOAP faults. Its site states coverage of 31 countries and now names a registry source for each region: VIES for the EU, HMRC for the UK, ABR for Australia, the BFS UID register for Switzerland, and the Bronnoysund register for Norway.

Pricing starts at $0/mo for 100 validations, then $19/mo (1,000), $49/mo (10,000), and $149/mo (100,000), with a Scale plan at 1,000,000/month and custom pricing above 100,000 per month. It offers Redis-backed caching with sub-10ms cached responses and a public playground at taxid.dev/try (shared demo key, no account required), but no documented batch validation, no webhooks, no published SDK packages (only code snippets), and no published OpenAPI spec or rate limits at the time of writing.

Who should use what

• Best for developers: Avatcado. Typed SDK, magic test numbers, structured errors with docs links, batch validation, stale cache fallback, free VAT rates, 32 countries across 5 regions, and 500/mo free tier.
• Best for full VAT compliance: VATstack. Webhooks, Stripe sync, OSS reporting, batch, geolocation. The most complete platform, at a higher price.
• Cheapest EU-only option: vatlayer. $9.99/mo, but no UK support and dated DX.
• Best country coverage on a budget: VATsense. AU, NO, CH, ZA, BR support, 7 SDKs, granular pricing from €5.99/mo.
• UK invoicing focus: vatapi.com. HMRC-compliant invoicing, currency conversion, but limited developer tooling.
• Already using other APIStax APIs: APIStax. Shared credits across PDF, geocoding, and barcode APIs, plus Java, PHP, and Quarkus SDKs, but VAT is a secondary feature with no batch or caching.
• Cheapest USD entry tier: taxid.dev. $19/mo undercuts most EUR-priced competitors for US-based teams, but it lacks batch validation, webhooks, and published SDKs.

Try it yourself

The best way to evaluate is to make a few requests. Avatcado's free tier gives you 500 validations per month, enough to build and test a complete integration before committing.

import Avatcado from '@avatcado/node';

const avatcado = new Avatcado('avat_test_your_api_key');
const { data, error } = await avatcado.vat.validate({
  vatNumber: 'DE123456789',
});

from avatcado import Avatcado

avatcado = Avatcado("avat_test_your_api_key")
result = avatcado.vat.validate("DE123456789")

Or with curl:

curl https://api.avatcado.com/v1/validate?vat_number=DE123456789 \
  -H "Authorization: Bearer avat_live_your_api_key"

Read the Avatcado documentation for the full API reference, SDK setup, and test mode guide.

Try Avatcado free →

Sources

Feature and pricing claims for each competitor were verified against the vendor's own public pages, verified 2026-08-13. Re-check before citing, as pricing and feature availability can change without notice.

• VATstack, verified 2026-08-13: vatstack.com/pricing and vatstack.com/docs
• vatlayer, verified 2026-08-13: vatlayer.com and vatlayer.com/product
• VATsense, verified 2026-08-13: vatsense.com and vatsense.com/documentation
• vatapi.com, verified 2026-08-13: vatapi.com
• APIStax, verified 2026-08-13: apistax.io and apistax.io/pricing
• taxid.dev, verified 2026-08-13: taxid.dev and taxid.dev/pricing