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Vatstack Alternative — TaxID
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 developers are asking are the free tier ceiling (20 requests/month) and the paid plan ceiling ($9/month for just 1,000 validations). TaxID starts free at 100/month and scales to 1,000,000/month from $149. Here's what you get, and what you give up, with each.
Disclosure: TaxID is our product. Competitor data is sourced from public pricing pages and documentation, accurate as of May 2026. We link to source pages where possible. Pricing may have changed — always verify on the vendor's site.
Feature comparison
| Feature | TaxID | Vatstack |
|---|---|---|
| EU countries supported | — | 27 |
| VIES-backed validation | ||
| Response caching | Redis 24h | Unknown |
| Free tier requests/mo | 100 | 20 |
| Max paid requests/mo | 1,000,000 | 1,000 |
| Batch validation | — | |
| Webhook notifications | — | |
| SLA guarantee | — | — |
| Company name in response | ||
| Cached response time | 10ms | 300ms |
| Starting price | $0/mo (Free) | $9/mo ↗ |
Why developers switch from Vatstack
Vatstack limitations
- Free tier limited to 20 requests/month
- No SLA guarantee on free/starter plans
- VIES service unavailability not transparently communicated
- No batch validation endpoint on lower tiers
TaxID advantages
- 5× more free requests: 100/month vs Vatstack's 20
- Sub-10ms cached responses vs Vatstack's ~300ms
- 100× higher scale ceiling: 1M/month vs Vatstack's 1,000/month paid max
- Format validation before VIES call — saves quota on typos and invalid inputs
- Transparent VIES downtime errors with explicit service_unavailable status
When to choose Vatstack instead
Vatstack has genuine strengths that TaxID doesn't match today. If your workflow depends on webhooks — async callbacks when a VAT status changes — Vatstack supports this natively and TaxID doesn't. If you need a dashboard-driven team workflow where non-developers can review validation history, Vatstack's UI is stronger. And if you need formal SLA documentation for enterprise procurement, Vatstack is a more established vendor name. If none of these apply — no webhooks, developer-only integration, startup-to-growth scale — TaxID will cost less and respond faster.
Switching from Vatstack to TaxID
The core change is the endpoint URL and authentication header. Both APIs return company_name, valid, and company address — no downstream code changes needed for the core validation logic.
GET https://api.vatstack.com/v1/validations?query=DE123456789 (Header: X-API-KEY)
GET https://taxid.dev/api/v1/validate/DE/DE123456789 (Header: Authorization: Bearer)
Both return company_name — no downstream code changes needed for the core field. Vatstack uses X-API-KEY header; TaxID uses Bearer token.
Start with TaxID free
100 validations/month free. No credit card. API key in two minutes.
Frequently asked questions
Does TaxID support Vatstack webhooks?
Not currently. TaxID is a synchronous REST API — each validation request returns a result immediately. If your workflow depends on async webhook callbacks when VAT status changes, Vatstack's webhook feature is currently unique to them. This is an honest limitation of TaxID today.
How do I migrate from Vatstack to TaxID?
Change the endpoint from api.vatstack.com/v1/validations?query=DE123456789 to taxid.dev/api/v1/validate/DE/DE123456789. Change the auth header from X-API-KEY to Authorization: Bearer. Both APIs return company_name and valid status — field names are compatible with minimal code changes.
How does TaxID handle VIES downtime vs Vatstack?
TaxID returns an explicit service_unavailable status when VIES is unreachable, with a boolean valid: false. This is documented in the error reference. We recommend building a fallback that allows the transaction when status is service_unavailable, rather than hard-failing customers during EU maintenance windows.
Vatstack vs TaxID pricing: what's the real cost at scale?
Vatstack's paid plan maxes out at 1,000 validations/month. For anything above that, you'd need to contact them for custom pricing. TaxID's Business plan covers 100,000 validations/month at $149, and custom plans scale to 1,000,000/month. For a SaaS with 500 B2B checkouts/month, TaxID's Starter plan ($19) is cheaper than Vatstack's entry tier ($9 for only 1,000 max).