When founders pitch me their marketplace ideas, most of them sound like a consumer app: the next Airbnb for something, the next Etsy for something else. Exciting categories, crowded fields, brutal economics.
Meanwhile, the founders who quietly show up with wholesale food, industrial supplies, or trade services marketplaces have a different conversation with me entirely. Less "how do I go viral," more "my buyers reorder every two weeks and I need to invoice them properly."
The boring ones are where the money is. Here's why, and here's what building one actually requires.
Why B2B wins on the economics
Three structural advantages, none of which consumer marketplaces get:
Order size. A consumer marketplace fights for $40 baskets. B2B orders start in the hundreds and go to five figures. Same commission percentage, very different absolute numbers.
Repeat purchasing is built in. A business that found a reliable supplier through your marketplace doesn't want to re-run that search. Consumer marketplaces buy their retention with marketing; B2B marketplaces get it from the nature of procurement.
The moat is administrative, not emotional. Approved supplier lists, negotiated terms, purchasing routines. Once a buyer's workflow runs through your marketplace, switching means redoing paperwork nobody wants to redo. That's a better moat than a loyalty program.
The B2B spectrum (where founders overbuild)
I think of B2B marketplaces on a spectrum:
B2B Lite: a catalog and a checkout, where the buyers happen to be businesses. Wholesale quantities, business pricing, but mechanically it works like any marketplace.
B2B Plus: the middle band. Quote requests, tiered pricing, gated access for approved buyers, proper invoicing.
B2B Enterprise: ERP integrations, punchout catalogs, procurement compliance. Mirakl territory, seven-figure implementation budgets.
Three bands, one trap. Where your niche sits decides what you build first.
The classic mistake is looking at the enterprise end and concluding you need all of it before launch. You don't. Most niches transact happily at Lite, with exactly one or two Plus features that their specific industry can't live without. The skill is knowing which ones.
What B2B founders actually ask me for
Running the platform under many marketplaces means the feature requests come to my inbox, and B2B founders are wonderfully consistent. Ranked roughly by how often I hear them:
Tiered / volume pricing. "10 units at one price, 100 at another." A founder building a hyperlocal wholesale food marketplace made this her one non-negotiable - and she was right that her niche can't function without it.
Quote and RFQ flows. Some B2B purchases don't have a fixed price; the listing is the start of a negotiation, not the end. An antiques and reproductions platform asked for exactly this - buyers request, sellers quote.
Gated access. Approved buyers only, wholesale prices hidden from the public, sellers vetted before listing. B2B trust runs on gates.
Real invoicing. Businesses need proper invoices, and in some countries this is becoming law, not preference - France is phasing in mandatory e-invoicing for all B2B transactions, and marketplace sellers there will be inside that system whether their platform is ready or not.
Net terms. "Buy now, pay in 30 days" is normal procurement, and it's the hardest one on this list - it turns your marketplace into a credit decision.
Honest disclosure, since I build one of these platforms: my own covers the Lite-through-Plus band - tiered pricing, gating, invoicing - and the deeper asks like RFQ flows and net terms are the frontier I'm still building toward. Which is exactly the point of the spectrum: nobody serves all of it, and no niche needs all of it.
The advice
If you're picking a marketplace idea right now: look at the industry you already know from the inside - the one where you know what the purchasing actually looks like. Find the transaction that still happens over phone calls and emailed spreadsheets. Then scope ruthlessly: launch at Lite, add the ONE Plus feature your niche genuinely can't transact without, and ignore the enterprise end entirely until a customer with an enterprise budget forces the issue.
Validate before you build any of it: ten suppliers who say they'd list, ten buyers who say they'd order. B2B founders can literally call their market on the phone. That's an advantage consumer founders would kill for - use it.
Go deeper
I built a B2B marketplace live on camera, from idea to working checkout, and broke down the hidden opportunities: How to Build a B2B Marketplace (Hidden Opportunities Founders Ignore)
The written version of the argument, with the builder underneath it: The B2B Marketplace Builder
- Rasmus
P.S. This is issue #3 of The Marketplace Guy. I build Prometora, a marketplace platform, and this is where I write down what running the infrastructure under many marketplaces teaches me. If someone forwarded you this: you can subscribe at themarketplaceguy.beehiiv.com.