---
title: "VAT Format Validation (x402)"
method: GET
path: "/x402/v2/vat-format-validate"
tags: ["x402"]
---

# VAT Format Validation (x402)

`GET /x402/v2/vat-format-validate`

## Request

- Base URL: `https://api.strale.io`
- URL: `https://api.strale.io/x402/v2/vat-format-validate`
- Auth: none required

Validate a European VAT number format against country-specific rules. Pure algorithmic — does NOT check VIES. Use vat-validate for full VIES verification. Supports all 27 EU countries + GB, CH, NO.

## Query parameters

- `vat_number` string, required: VAT number including country prefix (e.g. SE556703748501)

## Response `200`

Success

- object
  - `valid` boolean
  - `vat_number` string
  - `country_code` string
  - `country_name` string
  - `format_valid` boolean

## Other responses

- `402`: Payment required (x402 — pay with USDC on Base)

---

[API](https://skmtc.dev/strale/apis/strale-api-2.md) · [All operations](https://skmtc.dev/strale/apis/strale-api-2/llms.txt) · [OpenAPI document](https://skmtc.dev/strale/apis/strale-api-2/revisions/a5293878cfc6?raw)