How to Grow Your Marketplace to 500,000 Users | Zoneless

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How to Grow Your Marketplace to 500,000 Users<br>What I learned growing PromptBase from an empty marketplace into a business with 500,000 users and 300,000 listings.<br>By Zoneless· July 30, 2026 ·7 min read<br>On this page 1. Be seller number one<br>2. Get sellers before buyers<br>3. Treat your early sellers like deities<br>4. Help sellers bring your first buyers<br>5. Turn every listing into a landing page<br>6. Add trust early<br>7. Add recurring revenue<br>8. Keep the flywheel moving<br>Make payouts a reason sellers stay<br>I grew PromptBase, a marketplace for AI prompts, from zero to more than 500,000<br>users.

When I started, I had no users, two listings, and a website that did not look<br>particularly great. This was before AI tools could help you design and build<br>everything. You can read the post I wrote on the day I launched<br>it. I was still trying to work out whether<br>anyone would want to sell an AI prompt, let alone buy one.

Marketplaces are hard to get started, but they are fantastic businesses once<br>they work. Every new seller adds more products. More products attract more<br>buyers. More buyers attract more sellers. That loop is why marketplaces can<br>become so difficult to stop.

They're also incredibly fun to run. You're looking after a small economy filled<br>with buyers, sellers, browsers, big spenders, and people trying to make their<br>first sale.

Here are the things that helped me get PromptBase moving.

1. Be seller number one

If you can, become the first seller on your marketplace.

I uploaded the first few prompts to PromptBase myself. It gave the site some<br>initial inventory, and nobody cared that the owner was selling products on his<br>own marketplace.

More importantly, it forced me to use the seller experience. I saw where the<br>listing form was confusing, which information was missing, and what it felt like<br>to wait for a sale. It's much easier to build for sellers when you are one.

2. Get sellers before buyers

People often describe marketplaces as a chicken and egg problem. At the very<br>start, I don't think they are. You need sellers first.

A marketplace without inventory is just an empty website. Sellers are also more<br>motivated to take a chance on something new because they want to make money.<br>Your job is to show them that your marketplace could be a good place to do it.

Find the places where your sellers already spend time. For PromptBase, that was<br>Reddit. I left relevant comments in AI communities explaining that, if someone<br>wanted to do the very strange new thing of selling a prompt, they could do it on<br>PromptBase.

Don't spam every community you find. Join useful conversations and tell the<br>right people about the site when it genuinely helps them.

3. Treat your early sellers like deities

Once someone joins your marketplace, do everything you can to keep them<br>interested.

Tell them when a listing gets a view or a favourite. Send them a personal<br>message after their first sale. Fix the bugs they find immediately. Build the<br>small features that make their work easier. Share their listings from your own<br>social accounts.

At this stage, your early sellers are taking a risk on you. If they keep adding<br>good products, the marketplace starts to feel alive. If they lose interest,<br>you're back to an empty site.

Their questions are also some of your best product research. If three sellers<br>struggle with the same thing, it probably needs fixing.

4. Help sellers bring your first buyers

Getting buyers is harder, especially when your marketplace is small and does<br>not have much inventory. This is the point where many marketplaces stall. If<br>sellers do not make sales, they eventually stop posting.

The easiest place to find your first buyers is often through your sellers. A<br>marketplace comes with a built-in affiliate network. Sellers want to make sales,<br>so they have a reason to share their listings on social media, their own<br>websites, and anywhere else they have an audience.

Make that easy. Let sellers customise their storefront so they are proud to<br>share it. Give them personal links and a reason to use them, such as lower fees<br>on any sale they bring in. Both worked well for us on PromptBase.

5. Turn every listing into a landing page

Marketplaces have an SEO advantage that most websites do not. Every new product<br>creates a new page of user-generated content that can appear in Google.

One very specific listing might only bring in one or two visitors each month.<br>That does not sound exciting. But when you have hundreds or thousands of<br>listings, those small numbers add up. The visitor who lands on one product may<br>then browse the rest of the marketplace and buy something else.

PromptBase now has around 300,000 listings. That is 300,000 pages, each with a<br>chance of bringing someone new to the site.

Make sure each listing has a useful title, description, category, and a clean<br>URL. Then make related products easy to discover. SEO takes time, so start doing<br>this while the...