Introduction

The Kontakto API consolidates all entities with a business ID (Y-tunnus) into a single, easily searchable registry.

This API offers quick and effortless access to public registry information, making it a practical solution for those needing comprehensive data on Finnish companies through a single interface.

The general usage pattern for interacting with the Kontakto API is straightforward.

Usage pattern

1. Search for a company named "Kontakto" by making a GET request to https://api-v2.kontakto.fi/search?q=kontakto

2. Display an auto-updating list of search results to the user (autocomplete/typeahead)

3. The user selects the correct company from the list.

4. Fetch all details of the selected company by making a GET request to https://api-v2.kontakto.fi/companies/1234567-8

5. The company’s basic information can then be written into the appropriate fields of the system in use, or the fetched company details can be displayed to the user, allowing them to choose which information to update.

Current data sources

• Yritysten ja yhteisöjen tiedot (Yritys- ja yhteisötietojärjestelmä)
• Verkkolaskuosoitteet (TIEKE)
• Verkkotunnukset (Traficom - Liikenne ja viestintävirasto)
• Postinumerot (Posti)
• Tilastokeskus