Check a Belgian company by API: KBO and the NBB

KBO/BCE enterprise register and NBB Central Balance Sheet Office · not covered yet · checked 11 November 2026

The official route

Belgium splits company data over two bodies.

Filed annual accounts are with the National Bank of Belgium (NBB), in its Central Balance Sheet Office. The NBB has web services, described on its developer portal. You look up a company's filings by enterprise number and fetch a filing's accounting data as JSON. Under the NBB's general terms for web services (v1.0, March 2022) the product "Authentic Data Query" is free of charge. It needs a signed subscription form, a developer portal account and a manual approval. The terms say free products are usually activated within a week.

Name, address and status belong to the enterprise register (KBO/BCE). It has an open-data offer, KBO Open Data, behind a free registration. We have not found or read its licence text.

Where it gets hard

Without a key the NBB web service answers 401, "missing subscription key" (checked 2026-11-05). There is no keyless route to the data.
The NBB's public consultation site is a web app. Its internal API is not a published interface, so we don't use it.
Article 5 of the NBB terms says customers "may use annual accounts data downloaded ... free of charge and without limitation, unless provided otherwise by law" but "may not transfer their access rights ... to a third party". We have not settled how that applies to a service that answers lookups for its own customers.
The JSON also holds administrators and shareholders, who are natural persons.
We asked for access on 2026-11-08 and have no key yet. Our code for Belgian accounts follows the published spec and has never seen a real response.

One call

Bosco Labs reads neither Belgian source today. What counterparty-check does return for a Belgian company:

Check	Source for this country
Register status	The LEI record (GLEIF), if there is an LEI
VAT number	VIES
IBAN	ISO 13616 check digits; the country is compared too
Company on sanctions lists	OFAC, UN, UK, EU and US export lists
Recent accounts	ESEF annual reports, listed companies only
Insolvency	Unverified: no Belgian source

Want Belgian accounts or KBO status in the check? Tell us at support@boscolabs.dev. The countries people ask for go first.

What we do not cover

KBO status, legal form and address.
NBB accounts, until the key is approved and tested.
Insolvency, directors and shareholders in Belgium.

Sources

Bosco Labs does not read this register yet. Need it? Tell us: requests decide the order.

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