To sell on OnBuy, you register as a seller, list your products in the format OnBuy requires, and keep your stock and orders in sync. The quickest way to do all three is to connect your existing store to OnBuy with Koongo, which automates the data work so you can list in an afternoon rather than a month.
But before the how, the why. OnBuy has a few things going for it that set it apart from the marketplaces most sellers start with. Here’s what OnBuy is, why sellers are moving to it, the one real challenge in getting listed, and exactly how Koongo handles that challenge.
This offer is an early-bird deal: pay for one month of your seller subscription by 31 July 2026, and your next 12 months of subscription are free, so you get 13 months of selling for the price of one. Because OnBuy, easyShop, and Comet all run on the same OnCommerce account, that single subscription covers all three marketplaces as they launch. Standard selling fees on your actual sales still apply, so it’s the subscription cost that’s waived, not selling on the platform entirely.
What is OnBuy?
OnBuy is an online marketplace and part of the OnCommerce platform. OnCommerce describes it as one of Europe’s fastest-growing marketplaces, now live in more than 21 countries, with quarterly sales growth above 150% across its key markets.
For a seller weighing up where to expand next, growth like that matters: a marketplace adding shoppers quickly means more potential buyers for your listings, and getting established early means building your sales history before the channel gets crowded.
Why sell on OnBuy?
Three things make OnBuy worth a serious look, beyond its size.
It doesn’t compete with you. OnBuy says it never holds its own stock. Unlike marketplaces that sell their own products alongside yours, OnBuy makes its money by connecting sellers with shoppers, not by outselling them. For a seller, that removes a frustration familiar to anyone who has watched a marketplace undercut them on their own listing.
It brings shoppers back. OnBuy describes itself as the only marketplace to offer customers instant cashback on everything. It links that cashback model to a 51% returning-customer rate, according to its own figures. Repeat shoppers mean your products are seen by buyers who already trust the platform.
It reaches across Europe. With a presence in more than 21 countries, OnBuy gives you access to European shoppers through a single marketplace, rather than setting up and managing separate local marketplaces country by country.
The challenge: getting your product data right
Here’s the honest part. Every marketplace has its own product data requirements, and OnBuy is no exception. To list successfully, your products need:
- Correct categorisation to OnBuy’s own category structure
- Product identifiers such as GTINs (Global Trade Item Numbers, the barcodes marketplaces use to match products to their catalogue)
- A specific listing format for titles, descriptions, attributes, and images
- Live stock and price data that stays accurate as things change in your store
Doing this by hand means exporting your catalogue, reformatting it to OnBuy’s spec, uploading it, and then repeating parts of that work every time your stock or prices change. For a catalogue of any size, that’s hours you don’t get back, and every manual step is a chance for a listing error or an oversell.
How Koongo connects your store to OnBuy
This is the work Koongo automates. Koongo’s Marketplace Manager is a wizard-based, no-code integration that connects your store to OnBuy through an API integration, a two-way real-time connection. It handles the three things that otherwise eat your time:
- Product sync. Koongo’s attribute mapping aligns your store’s data fields to OnBuy’s required fields automatically, including identifiers like GTINs. You choose the channel, and Koongo formats the catalogue.
- Inventory sync. Stock levels update across every connected channel, so you never oversell on OnBuy while running low in your store or on another marketplace.
- Order sync. OnBuy orders import directly into your store, so you manage and fulfil everything from one place.
Koongo works with Shopify, WooCommerce, Magento, PrestaShop, BigCommerce, Wix, Shopware, Lightspeed, and custom platforms via API. You can see the full OnBuy integration on the OnBuy channel page.
How to start selling on OnBuy in 3 steps
- Register as an OnBuy seller. Set up your seller account through OnBuy.
- Connect your store with Koongo. Start on a free plan with no credit card required; paid plans start from €24/month with a 7-day free trial. The setup wizard walks you through it, with no coding.
- Go live. Koongo maps your catalogue to OnBuy, then keeps your stock and orders in sync automatically.
An extra reason to start now: the early-bird promo
There’s a timely incentive to register. OnCommerce is running an early-bird offer: pay your first month’s subscription by 31 July 2026, and your next 12 months of subscription are free. OnBuy subscriptions start from £25/month according to OnCommerce, and standard selling fees on your sales still apply.
Because OnBuy runs on OnCommerce, one subscription also sets you up for easyShop and Comet as those marketplaces launch later in 2026. Start on OnBuy now, build your sales history, and be ready for all three.
Full details on the offer are here: easyShop is coming: 13 months of selling for the price of 1
FAQ
How do I sell on OnBuy?
Register as an OnBuy seller, then connect your store to OnBuy. Koongo’s Marketplace Manager automates the listing, stock, and order sync through a wizard-based setup with no coding required.
Does OnBuy compete with its own sellers?
No. OnBuy says it never holds its own stock, so it doesn’t sell products in competition with the sellers listing on it. It earns by connecting sellers with shoppers.
How many countries is OnBuy available in?
OnCommerce reports that OnBuy is live in more than 21 countries, making it a way to reach European shoppers through a single marketplace.
What do I need to list products on OnBuy?
You need your products categorised to OnBuy’s structure, valid product identifiers such as GTINs, a listing format that meets OnBuy’s spec, and accurate stock and price data. Koongo handles the formatting and keeps the data in sync.
How much does it cost to sell on OnBuy?
OnCommerce states that OnBuy subscriptions start from £25/month. A current early-bird offer gives sellers who pay one month by 31 July 2026 their next 12 months of subscription free; standard selling fees still apply. Connecting your store with Koongo starts on a free plan.
Which e-commerce platforms can I connect to OnBuy with Koongo?
Shopify, WooCommerce, Magento (1 & 2), PrestaShop, BigCommerce, Wix, Shopware, Lightspeed, and custom platforms via API.
What is OnBuy’s cashback model?
OnBuy describes itself as the only marketplace to give customers instant cashback on everything, and links this to a 51% returning-customer rate. For sellers, that means shoppers who return to the platform to buy again.
Ready to reach European shoppers on a marketplace that won’t compete with you? Connect your store to OnBuy with Koongo, and claim the early-bird offer before it closes on 31 July 2026.
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