Sell on OnBuy with invtri — with commission-aware pricing.

Who can sell on OnBuy

Every OnBuy seller warrants that it “is a business” (clause 18.1.1)¹. Your country of registration must be on OnBuy’s list of supported countries, with a business bank or building society account there (clause 5.4)¹. You may hold one account, and OnBuy can reject an application without giving reasons¹.

OnBuy’s sign-up checklist asks for³:

• a link to the platform you sell on now³
• 50 reviews from the last 12 months, at least 90% of them rated 4/5 stars³
• GTINs for your products, unless they are not typically barcoded³
• bank accounts in the currencies of the sites you choose, or a WorldFirst or Payoneer account³
• a returns solution for each country, and a debit or credit card OnBuy can charge³

You also need business registration and VAT details where they apply, valid photo ID, proof of address dated within the last 3 months and a mobile phone for verification³. OnBuy says signing up takes less than 15 minutes, after which it emails the next steps³.

If you are based outside the UK:

• Businesses based in Austria, Belgium, Croatia, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Luxembourg, the Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland or the United States need no UK VAT number to sell on OnBuy UK unless already registered for UK VAT³.
• If you are registered for UK VAT, you must give your UK VAT number³.
• Businesses based anywhere else must register for UK VAT before selling on OnBuy UK, though they can still sell on OnBuy’s other marketplaces³.
• Prices must be delivered duty paid and include VAT, and returns need an address in the country the product was delivered to¹⁵.

Check your own VAT position with your adviser.

Sales fees, packages and payouts

OnBuy’s fee page, last modified on 19 January 2026, sets sales fees by category²:

“Sales Fees are charged on the total price of a Product including any delivery charges,” with a minimum of £0.25 per product in the UK². “All fees are subject to VAT where applicable”².

• Refunds: the fee page lists 20% of the order value, at least £0.25 and at most £5.00, while the Seller Terms charge 20% of the refunded Sales Fee per line item²¹.
• Disputes: £6.50 each; chargebacks: £14.00 each².
• OnBuy Boost, for sponsored listings: 5% to 30% on top of standard fees, charged only when a product sells³.

OnBuy also sells monthly account packages, Partner and Professional, on a “simple 30-day rolling agreement”; Professional adds sitewide branding and a Professional Seller badge³. OnBuy sets the package prices; check them when you sign up. The Application Fee is non-refundable and counts as your first month, and ending a package needs 30 days’ written notice¹.

OnBuy gives 30 days’ notice of fee changes¹. It says payment typically arrives “7 days after the expected delivery period ends”, and you can withdraw monthly or whenever a balance is available³.

Performance and response times

OnBuy rates each seller on Performance Metrics, but its Seller Terms put no figures on them¹. Missing them for two consecutive months lets OnBuy restrict your account and end it on 30 days’ notice (clause 20.3)¹.

• Reply to customer and OnBuy enquiries within 48 hours¹.
• Reply the same day to fraud-related cancellation requests¹.
• Check the Seller Control Panel daily¹.
• Slow dispatch, or a high rate of cancellations or refunds, can lead to restrictions¹.

Rejecting orders may affect your metrics¹. A customer who has waited two days for your reply can take the matter to OnBuy Customer Care⁵.

Product Pages, GTINs and listing limits

OnBuy runs a catalogue. A Product Page is “A Product specific page on the OnBuy Marketplace where Sellers can create a Listing”, and your Listing is your offer on it¹. You can add a Listing to an existing Product Page or create a new page; changes to an existing page need a request, which OnBuy may refuse¹.

Products generally need barcodes, and OnBuy points to GS1, “the only authorised provider of Global Trade Item Numbers (GTINs)”³. Owners of a UK or EU trademark can apply for a barcode exemption³.

To publish new products through the API, OnBuy must first enable live product creation on your account⁴. You review the products on its Approve Products page, then submit a support ticket⁴.

• No listing may exceed £30,000, including taxes and delivery¹.
• OnBuy can ask you to cut excessive listings within 48 hours, and can cap your sales volume¹.
• A separate Prohibited Products Policy applies¹.
• Subscribers can also list for UK sales on other marketplaces in the OnCommerce Network¹.

When a third party ships your orders

OnBuy’s Seller Terms make you “solely responsible for fulfilment of Orders”, including sourcing, storing and delivering the products (clauses 6.5.1 and 6.6.1)¹. If a third party fulfils an order, “the Seller shall select a non-branded packaging option if such option is available” (clause 6.6.8)¹.

Dispatch, tracking and returns

You choose a delivery timeframe of 1 to 30 days and a Handling Time of up to 10 days¹. Dispatch is due by the later of 24 hours, unless you set a longer Handling Time, and the expected dispatch date shown at ordering¹. Priority Orders placed before your cut-off must go out the same day¹.

You can accept or reject each order, and an order not marked as dispatched within 30 days is cancelled and refunded automatically¹. Tracking is not expressly required, but if an untracked parcel is late or you cannot prove delivery, you refund or replace it at the customer’s choice¹.

OnBuy’s Customer Terms set the return rules⁵:

• Customers can cancel a non-faulty order up to 30 days after receiving it, telling you through OnBuy⁵.
• A customer who finds a product faulty within 30 days of receiving it is entitled to a full refund⁵.
• You refund within 14 days of getting the goods back, including standard postage⁵.
• Customers pay return postage on non-faulty goods; you pay on faulty or not-as-described goods⁵.
• Personalised, perishable and opened hygiene items, opened sealed media or software, and started downloads are excluded⁵.

Finding your OnBuy API keys

OnBuy’s API is documented as the OnCommerce API, covering OnBuy, easyShop and Comet (UK)⁴. “The API settings page can be found in your Seller Control Panel”: it is the API Integration page, which shows⁴:

• a Consumer Key and a Secret Key, in “two sets of keys, Live and Test”⁴
• your Seller ID, “your unique seller ID”⁴
• your Seller Entity IDs: one for OnCommerce UK, and another for each location you enable⁴

The UK site ID is 2000⁴. In invtri, this site ID goes in the Shop Code box. OnBuy’s documentation says to use the Test keys while integrating with the API and the Live keys when you go live; an unverified account cannot create test orders⁴. For the connection steps, see How to connect OnBuy.

OnBuy and OnCommerce this year

ChannelX reported in June 2026 that OnCommerce reaches “over 140 million shoppers” across 21 markets, and that 51% of OnBuy sales come from returning customers⁶.

• 19 January 2026: OnBuy last modified its fee page, which shows the 15.00% standard selling fee².
• 5 February 2026: ChannelX reported that OnBuy had launched around 20 new country sites across Europe in the past year, with a US site “coming soon”⁷.
• 22 June 2026: OnCommerce launched for OnBuy, with one account and catalogue, one combined balance and VAT handled automatically; ChannelX said easyShop and Comet would follow later in 2026⁶.
• 23 July 2026: ChannelX reported plans for a Priority Service in Q4 2026, retail media, a mobile app and a US marketplace in 2027⁸.
• 24 July 2026: the API added GPSR product-safety data⁴.
• 13 October 2026: easyShop.com opened across 21 European countries, “powered and operated by OnCommerce”, ChannelX reported, still describing Comet as soon to launch⁹.