Documentation

Validate an EU VAT number, read a VAT rate or check an IBAN with one curl call: no key for 20 calls a day, then a free key for 100 calls a month, no card.

Bearer keys are shown once after sign-up and stored hashed. What the anonymous, free, prepaid-credit and monthly-plan tiers may call, and how to rotate a key.

Every error is an RFC 9457 problem document with a stable code: invalid_parameter, quota_exceeded, rate_limited, vies_unavailable and more, with the fix.

Per-second limits per key (free 2, plan 10), the monthly allowance, prepaid credits used after it, and the RateLimit headers that say where you stand.

No availability percentage is sold on any tier: the record is public on the status page and /api/v1/status with dated incidents; here is what it holds and why.

Send the quarter's B2C sales as CSV or JSON; get the OSS or IOSS return lines per member state and rate, checked against a dated rates table, with totals.

SIREN, SIRET or French VAT number to legal form, NAF code, address, headcount band, status and officers, from the open French registries, with source and date.

State rates for the 50 states and DC, combined averages per ZIP where a state publishes an open ZIP file (OH, WA), coverage stated per answer.

• GET/vat/validate
• POST/vat/validate/bulk
• GET/vat/validations
• GET/vat/validations/{id}
• DELETE/vat/validations/{id}

• GET/vat/rates
• GET/vat/rates/{country}

• POST/vat/oss/return

• GET/iban/validate
• POST/iban/validate/bulk

• GET/fr/company/{id}
• POST/fr/company/bulk

• GET/us/sales-tax

• POST/einvoice/create
• POST/einvoice/validate
• POST/einvoice/parse

• GET/me

• GET/status

OpenAPI 3.1, for generators and gateways.

The European Commission’s VIES API is free and needs no key: REST and SOAP compared, the fields, every error code, the limits, and what to build around it.

What MS_UNAVAILABLE, SERVICE_UNAVAILABLE and TIMEOUT mean, why member states go dark, and the four-step fallback that keeps a checkout or an invoice run going.

The VAT rate on SaaS, downloads and streaming in the 27 member states, the e-book exceptions and the OSS rule that picks the rate. Verified 2026-10-24.

Copy-paste functions for Node.js, Python and PHP that validate an EU VAT number on VIES in one REST call, handle a VIES outage and read the consultation number.

How an IBAN is built, how the ISO 7064 mod 97-10 check works step by step on a real IBAN, what it catches and misses, and why the BBAN pattern matters too.

Since July 2021, EU B2C distance sales and digital services are taxed at the customer’s country rate. How to pick it per sale and the €10,000 threshold.

INSEE’s Sirene API and the open Recherche d’entreprises API are free. What each returns, their limits (30 a minute, 7 a second) and what neither gives you.

A CSV of VAT numbers in, a dated results file out: de-duplicate, check the structure offline, pace the calls, keep provenance and consultation numbers.