KVK API for Webshops: Automated Business Data with the Easiest KVK API

If you run a webshop that sells to business customers in the Netherlands, you know how critical accurate company information is. A KVK API lets you automatically retrieve and validate business data — without requiring customers to manually fill in every field. In this article, we’ll show you how the easy KVK API from KVKBase can transform your webshop’s B2B experience.

Why a KVK API is Essential for Webshops

B2B webshops deal with invoice details, VAT numbers, and business addresses on a daily basis. Errors in this data lead to returned shipments, incorrect invoices, and frustrated customers. With a Dutch business data API, you can automate the entire process: from KVK number lookup to VAT number validation.

The key benefits:

• Fewer errors — data comes directly from official sources
• Faster checkout — customers fill in fewer fields
• Fraud prevention — verify that a business actually exists
• Professional appearance — show that your webshop is serious about B2B

KVK Number Lookup at Checkout

One of the most powerful applications of the KVK API is automatically populating business details as soon as a customer enters their KVK number. With the KVK lookup API from KVKBase, a single API call returns the full company name, registered address, legal form, and more.

Picture this: a business customer starts the checkout process and enters their KVK number. Within milliseconds, all fields are automatically filled — company name, address, postal code, and city. That’s the power of KVK search API integration.

How Does It Work Technically?

The integration is surprisingly straightforward. You send a GET request to the KVKBase API with the KVK number and receive a structured JSON response containing all the KVK business data. You can use this directly to populate form fields.

GET https://api.kvkbase.nl/api/v1/kvk/{kvknumber}

The response includes:

• Official company name
• Registered address (street, house number, postal code, city)
• Legal form
• Active/inactive status
• SBI codes (business activities)

For more details on looking up KVK numbers, check out our KVK number lookup guide.

VAT Number Validation with VIES API

Beyond looking up KVK numbers, VAT number validation is essential for B2B webshops. When you sell products or services to businesses within the EU, you need to validate your customer’s VAT number to correctly apply the reverse charge mechanism.

The VIES validation API from KVKBase checks VAT numbers in real-time against the European VIES system. This ensures that:

• The VAT number is valid and active
• The company name matches the provided details
• You can correctly process the intra-community supply

This prevents issues with tax authorities and protects you against fraud. Learn more about VAT validation in our article on VAT number validation with VIES API.

Combine KVK and VAT Validation

The real power lies in the combination. When a customer enters their KVK number, you automatically retrieve the associated VAT number and validate it through VIES — all in one seamless flow. Your customer barely notices anything, but behind the scenes, all data is checked and validated.

Fraud Prevention and Error Reduction

Fraud in B2B orders is a growing problem. Criminals use fake business details to order on account and never pay. With a business data API like KVKBase, you can instantly verify whether a company is actually registered with the Dutch Chamber of Commerce (KVK).

By using KVK open data during registration or checkout, you automatically filter out suspicious orders. For example, you can check whether:

• The company is active (and not deregistered)
• The provided address matches the KVK registration
• The legal form fits the type of order (sole proprietorship vs. BV)

This not only saves you money but also the time spent manually reviewing suspicious orders.

Accelerating B2B Onboarding

Many B2B webshops work with customer accounts that need to be approved first. This onboarding process can be significantly accelerated by automatically retrieving and verifying Dutch business data.

Instead of having customers fill out an extensive form and then manually checking everything, let the KVK API do the heavy lifting:

1. Customer enters KVK number — all business details are automatically retrieved
2. VAT number is validated — via the VIES validation API
3. Automatic approval — if all data checks out, the account can be activated immediately

This reduces onboarding time from days to seconds. Your customers can order faster, and you have less administrative work.

Discover how to further optimize the checkout experience in our article on checkout optimization with company data autofill.

Why KVKBase is the Easiest KVK API

There are multiple ways to retrieve KVK data, but not all are equally user-friendly. The official KVK API requires an extensive registration process and has complex authentication. KVKBase offers an easy KVK API that you can integrate in minutes:

• Simple API key authentication — no OAuth flows or certificates needed
• Clear documentation — with code examples in popular languages
• Reliable uptime — so your webshop can always count on up-to-date data
• Combined data — KVK data, VAT validation, and address data in one API
• Free trial period — test the API without obligations

Whether you use WooCommerce, Shopify, Magento, or a custom webshop: the KVKBase API integrates seamlessly with any platform.

Practical Applications per Webshop Platform

WooCommerce

Add a KVK number field to your checkout and use a WordPress plugin or custom JavaScript to call the KVKBase API. Business details are automatically populated in the billing fields.

Shopify

With Shopify Functions or a custom app, you can integrate the KVK lookup API into your checkout. Validate business data before the order is finalized.

Custom Webshops

For custom-built webshops, the KVKBase API offers maximum flexibility. Use our REST API with your favorite programming language and build exactly the flow that fits your webshop.

Getting Started with the KVK API

Ready to enhance your webshop with automated business data? The KVK API from KVKBase is the fastest way to add KVK number lookup, VAT number validation, and business verification to your webshop.

With our Dutch business data API, you have everything you need in one platform: from KVK data to VIES validation, from address verification to fraud detection.

👉 Try KVKBase for free and discover how easy it is to integrate reliable business data into your webshop.