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EU VAT Number Validator
x402
EU VAT Number Validator is a paid API for AI agents from flat-rate-llm.kikoribera03.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).
Validates a single EU VAT number offline, checking country prefix, format, and check-digit algorithm where available, with explicit indication of whether checksum was verified.
Price / call$0.005
Success—
StatusUnknown
How this service works
60 paid endpoints with no metering, no API key and no account. Each endpoint has one flat price per call, whatever the size of the request: LLM completions with automatic failover across several large models, read-only EVM tooling over Base, Ethereum, Polygon, Arbitrum and Optimism, and pure crypto utilities that touch no network.
Output
Returns a JSON object with the original and normalized VAT number, a boolean valid flag, the detected country code, whether the format is valid, whether the checksum is valid, whether the checksum was actually verified (as opposed to only format-checked), and the count of EU countries for which checksum verification is supported.
Example use cases
Cleaning a supplier data import
“I'm importing a list of European suppliers and need to validate their VAT numbers one at a time — can you check DE345789012 and tell me if the format and check digit are correct?”
Onboarding form validation for EU businesses
“A user just entered 'FR 40 303 265 045' as their VAT number on our signup form — can you check if that's a valid French VAT number, including the checksum?”
Compliance check before issuing B2B invoice
“Before I issue a zero-VAT invoice to this Belgian company, can you verify that the VAT number BE0428759497 is correctly formatted and passes the check-digit test?”
Technical details
Endpoint
POSThttps://flat-rate-llm.kikoribera03.workers.dev/v1/util/vatWhen to prefer
Choose this endpoint when you need fast, deterministic, offline EU VAT number validation without making a live call to the EU VIES database. It is ideal for batch-cleaning company lists, validating form inputs at scale, or any scenario where network latency or VIES availability is a concern. If you need to confirm a VAT number is currently active in the VIES registry (not just correctly formatted), you would need a live VIES lookup instead.
Side effects
- Unrecognized or non-EU country prefix returns valid=false with no country match
- Malformed input with unsupported characters may return formatValid=false
- For countries without a published check-digit algorithm, checksumVerified is false and checksumValid may be null
- Very unusual spacing or delimiter styles may prevent normalization
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| vatrequired | string | The VAT number, with or without the country prefix and with any spacing. |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| vat | string | |
| valid | boolean | |
| country | string | |
| normalized | string | |
| formatValid | boolean | |
| checksumValid | boolean | |
| checksumVerified | boolean | |
| countriesWithChecksum | number |
Tags
x402
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