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2 months ago

How Mint Reached 40,000 Users in Two Months Using Convex

Alex Carrabre describes his company's bet on AI world models as "an out-of-the-money call option that this thing will be valuable." That's a strange way to talk about the product you're building a company around. It's also the most honest, coming from someone who's already watched one full-conviction bet fail to pay off. He isn't claiming world models are inevitable. He's saying the position is worth taking before anyone can prove it's right.

Alex works at Founders, Inc., a studio company in San Francisco, where he and his team build Mint, a harness for 3D world models. Two months after pivoting into the product, Mint had 40,000 users. Alex credits a chunk of that speed to switching the backend to Convex at the same time.

What a world model actually is

The term is young enough that it's worth pinning down before the rest of the story makes sense. A world model takes text or an image and turns it into a 3D space you can move around in.

World Model Flow DiagramWorld Model Flow Diagram

Once the space exists, you can do three things with it:

  • Fly through it.
  • Drop it into a game environment.
  • Populate it with other 3D assets.

Take the venue where the interview happened. Mint could generate a 3D version of Fort Mason's event space and let organizers decorate it with their own models ahead of time. A company planning an event there gets to see roughly what the room will look like before committing to anything, instead of squinting at a static floor plan or a generic mockup.

The team didn't arrive here from graphics or gaming. They got here by way of crypto.

From crypto to world models

Alex moved to San Francisco six years ago from Minnesota to raise money for his own startup. It didn't work out. He shut the company down, took a job, and spent a few years at other Silicon Valley companies while building side projects on his own.

About a year and a half ago he joined Founders, Inc. and started working on crypto products: a layer 2 on top of Ethereum, then the team's own chain. Some of it found real traction. A crypto Venmo passed 100,000 users. A gifting app did the same. But the same wall kept showing up.

"Crypto is kind of tainted," Alex says. "When you mention crypto, people generally don't want to use your products." The technology worked. The label was doing the damage, costing them users before anyone got as far as trying the product.

The pivot away started as something much narrower, an on-chain room builder that let people customize their spaces. While building it, the team got early access to the World Labs API and used it to prototype a different kind of experience. That prototype became Mint. The team is now one of the top users of World Labs' APIs.

Why Mint switched to Convex

The backend switch landed at the same moment as the product pivot. Convex had to hold up a brand-new app under real growth pressure from day one, with no gradual ramp into it.

Diagram: World Labs APIDiagram: World Labs API

"The speed and latency are insane, better than anything else out there," Alex says. "We went from 0 to 40,000 users in two months. No plans on switching anytime soon."

That shape is familiar. ClawHub's jump to a million weekly users followed the same pattern. A young product finds real usage fast, and the backend has to absorb the growth without becoming the thing that slows the team down.

Mint recently shipped an MCP integration. For the next two to three weeks the team's focus is making the in-product chat meaningfully better, and Alex is blunt about where it stands today: "Most users who come in, quite frankly, find it not the best experience, which is great because we can make it so much better."

Launch fast, then listen

Alex's answer to the perfect-product-versus-ship-it debate has moved the more products he's built. "Personally, I'm on the side of needing it to be super perfect," he says, describing his instinct, "but then you lose time chasing perfection."

What changed his mind was pattern recognition across several launches: "The more products we've built, the more we realize we actually don't know what users want. What we think is perfect is often not perfect from the end user's perspective, which is the only perspective that matters."

So the team ships rough and builds around what people actually do with it. The chat experience is going through exactly that right now. It's close to what Convex tells founders trying to reach an MVP quickly. The fastest way to learn what to build is to put something out and watch what happens.

Betting on the harness, not the niche

World models don't have an obvious killer use case yet, and Alex doesn't pretend otherwise. He points to a 2019 interview where Sam Altman described asking an AI system how it would make money. The room, full of investors, laughed at the idea as unserious. Today people route agents to generate revenue as a matter of course. None of which guarantees world models follow the same arc. It does mean a missing killer app proves very little on its own.

Every general-purpose technology seems to sit around waiting for the one application that makes it click.

TechnologyThe application that made it click
Large language modelsCoding
CryptoFinance
World modelsStill open

Gaming, architecture, construction, and visual effects are all live candidates for that third row. Mint's bet is on the tooling layer underneath whichever one wins, rather than on calling the winner early.

That also shapes how Alex thinks about competition. World Labs, the company behind the API Mint builds on, has its own editor, and there's real competition across the world-model space. The early days of AI coding tools give him a comparison to work from.

Cursor, early daysMint, now
Model it wrappedOpenAI, AnthropicWorld Labs
What it builtThe editorThe harness
The standing riskThe model providers ship their own editorWorld Labs already has one

Cursor started as a wrapper and built its own models later, back when the model providers weren't shipping competing editors. Mint is in that same wrapper phase now, betting that the world-model companies keep pointing their effort at the model rather than at the harness for using it.

The longer you let it sit

Asked what he'd tell someone about to start a company, Alex doesn't hedge: "Launch as quickly as you can. Get it out in the world and get people using it, because you'll find your way from there. The longer you let it sit, the better chance it has of dying."

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