Ecommerce Marketplace: How to Create an Online Marketplace Like eBay

Why building a marketplace is harder than it sounds (0:00)

Everyone says the same thing: build a marketplace like eBay. You search it on YouTube, you Google it, and it sounds so simple - just build a marketplace. But what no one talks about is how hard it actually is in the real world. Because the hard part isn't creating a website with listings. It's all the other things. Payments, getting sellers before buyers, trust, admin tools, shipping - all the boring stuff you don't think about when you start.

Most people don't fail because their marketplace idea is bad. They fail because they never get past version one. I know this because I've been building niche marketplaces myself. That's where I realized: when you say "just build a marketplace," that's a massive understatement.

My Nordic Mugs story (0:44)

In my case, one of the marketplaces I decided to build was a very niche one. It's called Nordic Mugs, a marketplace for buying and selling Moomin mugs. I actually picked something super niche on purpose because I thought that building a niche marketplace would be easier. But once I actually started building it, I realized very quickly that wasn't the case.

The real reason marketplaces fail (the cold start problem) (1:03)

The hardest part wasn't the idea or the building. It was the cold start problem. I built it, and then I realized I needed sellers before buyers - but buyers wouldn't come without listings first. So: sellers first. Then payments, trust, moderation, admin tools, and all the stuff you have to build on top.

Suddenly I realized I wasn't building another website - I was building a system. At that point it stopped feeling like a side project. That's also when it clicked for me: building a marketplace isn't a simple feature or a simple website. It's a whole machine. And just to show you, this is what my marketplace Nordic Mugs actually looks like.

The usual problem with building an ecommerce marketplace like eBay (1:59)

After building Nordic Mugs, I started noticing a pattern - not only on my own marketplace, but on pretty much every marketplace idea I saw online. Most marketplaces don't fail because the idea is bad. They fail because they never manage to ship the first version. And the reason isn't motivation - motivation is usually there. It's friction. There's just too much setup, too many tools, too many decisions you have to make very early on.

You're suddenly sitting there having to decide things like: what tech stack should I use? What payment provider? What about shipping, moderation, how do listings actually work? And none of those decisions move you any closer to your first users. What happens is people get stuck building the perfect marketplace - an eBay clone with all of eBay's features - before anyone has even signed up. By the time they're halfway there, they burn out.

That's when it really hit me. The real problem isn't building an eBay clone. It's getting to version one fast enough to see if anyone actually cares. Because marketplaces aren't proven on paper. They're proven by getting users and getting them to transact. That's when you know you've actually built something useful. If you can't get there quickly enough, your idea never really gets a chance.

After going through all this, my first idea wasn't to build a no-code tool. I actually went the opposite way. I built a marketplace boilerplate - something developers could use to build marketplaces faster. On top of that, I even created a course for becoming an AI marketplace developer. That helped to a point. But the biggest friction was still there: you still needed to be technical, and you still needed to make dozens of decisions before you could launch.

How Prometora approaches marketplace building (4:02)

That's when I started asking a different question. What if you could create your marketplace as easily as just describing it - so marketplace founders could focus on their idea, their niche, and on getting users, instead of on what tech to use, what payment provider, and the whole setup? This question didn't come from wanting to build another tool. It came from frustration - from building real marketplaces and seeing where people get stuck.

That's what eventually led to Prometora. Instead of starting with code or a blank project, Prometora starts with the idea itself. You describe the marketplace you want to build, the niche, and how you want it to work. From that description, Prometora generates the foundation for your marketplace - not just the pages, but the structure behind it. Because all marketplaces are quite different. Compare Airbnb to eBay, for instance. So Prometora generates the flow your marketplace runs on.

What matters to me here isn't replacing developers. It's removing the unnecessary decisions at the very beginning, without limiting what you can build later. You shouldn't have to lock yourself into a tech stack before you've talked to real users on your marketplace.

The goal with Prometora is to get you to version one fast, but on top of infrastructure designed to grow with you no matter how big you become. So if and when you become the next Airbnb-sized marketplace, you can still keep it on Prometora. When real users start showing up, you're not throwing anything away. You're improving, extending, and scaling what already exists. Prometora isn't trying to guess the final shape of your business on day one. It's giving you a foundation that works for your first user and still makes sense when you have hundreds of thousands.

Who Prometora is for (5:59)

If you're thinking about building a marketplace - whether it's small, niche, or something much bigger - the way I think about it is this: marketplaces aren't built in one moment. They're built by shipping, learning from users, iterating, shipping again, learning more, iterating again. That's how it goes.

Prometora is built for marketplace founders who want to start from an idea, build fast without cutting corners, and stand on infrastructure that doesn't box them in later as they grow. It's not for people trying to build a one-click business - Prometora doesn't replace thinking. There's still real work to do. You still have to figure out how to get users to actually use your marketplace. So it's for people who want to focus on the marketplace itself - the niche, the users, the dynamics - instead of getting stuck in setup before anything real exists.

If that sounds like you, go ahead and test out Prometora and see what it can generate from your marketplace idea. No pressure - just check it out and see if it fits how you think. And if you're interested in marketplace building in general - what works, what fails, how to build them - please subscribe to this channel. This is where I'll be sharing my learnings along the way. Thanks for watching, and I'll see you in the next one.