Marketplaces and Wholesale: Extra Channels, One System

A wholesaler can run marketplaces alongside a B2B portal and a B2C store without buying a second system, because Selldi treats channels as outputs of one catalogue rather than separate shops. In Selldi this is the job of CENTER, the central hub for the offer and its sales channels: you keep one product list, then publish each product per channel — B2B, B2C, or a marketplace like Allegro or Amazon — with its own channel price rules and its own stock buffer. Channel price lists recalculate from a shared base using margin, surcharge and rounding rules, stock buffers stop the same unit being sold twice across channels, and marketplace orders flow back into the same system as everything else. An audit journal records every pricing decision as a plain 'before → after' entry, so nobody has to guess why a channel price changed. That combination is what turns 'add a marketplace' from a second full-time job into a checkbox on an existing product.

Why wholesalers reach for marketplaces

The pull is rarely mysterious. A distributor with a solid B2B customer base looks at Allegro or Amazon and sees reach it cannot buy any other way: buyers who will never register for a trade account, but who happily click 'buy now' on a listing. The second driver is inventory that has to move — end-of-line stock, discontinued sizes, a pallet of last season's model that clogs the warehouse. A marketplace is a fast, low-commitment way to liquidate it in front of an audience that does not care about your catalogue structure, only about the product and the price.

So the intent is sound. The trouble is that most wholesalers bolt the marketplace on as a side project run by a spreadsheet and one patient employee, and that is where the cracks appear. Adding a channel is easy for a week. Keeping it honest for a year is the hard part, and it is the part that quietly costs money.

What usually breaks

The first thing to break is re-listing. When products live in the marketplace's own back office, every new item, every renamed variant, every corrected description is entered twice — once in your system, once on the platform. Multiply that by two marketplaces and a growing catalogue and you have a full-time typing job that produces nothing but the chance to make a typo in one place and not the other.

The second, and the expensive one, is overselling. If your warehouse stock is not shared with the marketplace, two buyers on two channels can each buy the last unit at the same minute. On a trade order you can apologise and back-order; on a marketplace a cancelled order is a metrics penalty and a public review, and platforms remember it. The third is price contradiction. A trade customer who also browses the consumer marketplace notices, instantly, when the 'wholesale' partner is selling the same box cheaper to the public. Nothing erodes a B2B relationship faster than a buyer feeling they are paying more than a stranger with a credit card.

None of these are marketplace problems. They are 'two disconnected systems' problems, and they disappear when the channels share one source of truth.

The hub model: one catalogue, many channels

The alternative Selldi uses is a hub. There is exactly one catalogue. A product exists once, with its master data, its images and its base price. Publishing it to a channel is a decision you make about that product, not a copy you paste into another tool. You choose which channels a product appears in — it can sit in B2B only, go public on B2C, or be pushed to a marketplace — and you can change that on any product without touching the others.

Pricing follows the same logic. Instead of typing a marketplace price by hand, you set channel price rules — a margin percentage, a fixed surcharge, a rounding rule — and CENTER recalculates the channel price list from the shared base. That means a marketplace can carry a deliberately different price from your trade shelf, on purpose and consistently, rather than by accident. When your cost base moves, you adjust the rule once and every affected listing follows. And because the audit journal keeps the 'before → after' of each pricing decision, a price on Allegro is never a mystery three weeks later — you can see exactly what rule set it and when.

Stock is where the hub earns its keep. Each channel gets its own stock buffer against the shared warehouse, so you can hold back a reserve for trade customers and still expose availability to the marketplace without ever promising the same unit twice. Marketplace orders then land back in the same order flow as your B2B and B2C orders — same fulfilment, same history, same warehouse decrement — so the marketplace stops being a separate island you reconcile by hand at month-end.

Who does what: operator versus owner

Running channels well is partly an organisational question, and Selldi splits it along a line that matches how wholesalers actually work. The operator handles the day-to-day: publishing and updating listings, processing channel orders, managing shipments, watching for alerts and clearing them. This is the person who lives in the channels every day and keeps them moving.

The pricing decisions — the margin rules, the price-list recalculations, the channel buffers, the automation rules — sit with the owner role. Those are the levers that move money across the whole shop, and one careless change can reprice an entire channel, so they belong to whoever is accountable for the numbers. The operator can see the pricing screens and get their work done; the buttons that rewrite a channel's economics are reserved. It is a small separation, but it is the difference between an employee who can process a hundred marketplace orders a day and an accidental repricing of your whole Allegro catalogue on a Friday afternoon.

When marketplaces are the wrong move

Honest answer: sometimes a wholesaler should not open a marketplace at all, and no software changes that. The clearest case is channel conflict. If your trade customers are themselves resellers who list on the same marketplaces, putting your own listings there means competing directly with the people who buy from you — you become their rival on the exact platform where they make their margin. That is a fast way to lose loyal accounts that are worth far more than incremental public sales.

The second case is commission economics. Marketplaces take a cut of every sale, and on thin-margin wholesale lines that cut can quietly turn a healthy trade product into a loss once the platform fee, the fulfilment and the returns are counted. The fee structures change and live on each platform's own site, so the discipline is simply to model your real per-item margin after commission before you list, not after. If the maths does not work on your best-selling line, adding volume through the marketplace only loses money faster. Selldi makes the mechanics of running channels painless — it cannot make a bad channel decision profitable.

If marketplaces do fit your catalogue, the point worth testing is whether one system can really hold all the channels together without the manual double-entry described above — and the quickest way to judge that is to open the working demo at demo.selldi.pl/showcase and click through the channel hub with your own kind of product in mind.