01 The NFT peak rewarded speed and punished shortcuts
Everyone was launching a marketplace
There was a stretch, from late 2021 into 2022, when it felt like a new NFT marketplace launched every week. Cryptobys, out of the UK, was building one of them, and they were building it seriously: web and mobile apps, an in-house engineering team, a real product rather than a landing page chasing the trend.
The trap in that market was rarely the chain itself. Teams poured their attention into wallets and contracts and shipped interfaces that felt like afterthoughts, which failed them at the worst possible moment, because a user deciding whether to trust a marketplace judges the product they can see and touch. Cryptobys had the chain side covered in-house. What they needed was a product experience built at the same level, and fast, while the window was open.
02 Their engineers on the chain, ETREXIO on the product people touched
An honest division of labor
This was a co-delivery, and we describe it as one. Cryptobys had its own in-house team, and we joined it rather than replacing it. The split was clean: their engineers owned the wallet and blockchain integrations, MetaMask among the wallets, and the web and mobile product experience ran through ETREXIO.
That kind of split works when the boundary is honest. Listing, browsing, buying, the screens and flows a user actually moves through on web and on mobile: that was our lane. The plumbing underneath, where assets move on real chains, stayed with the people who knew it best.
We say co-delivery deliberately, because the alternative framings are both false. This was not ETREXIO building a marketplace alone, and it was not a client team using us for overflow tickets. Two teams shipped one product, each owning the layer it was best at.
- Web and mobile marketplace apps: the product experience, built by ETREXIO
- Wallet and blockchain integrations owned by the client's in-house engineers
- MetaMask among the wallets their team wired into the product
- One clean boundary between the chain layer and the experience on top of it
03 Craftsmanship at the peak: the product had to feel calmer than the market
The part everyone underestimated
Building the experience layer of an NFT marketplace at the peak of the wave was its own moving target. The market was loud, the ecosystem underneath was changing monthly, and users arrived with real assets and real suspicion. Whatever happened on the chain, it surfaced through screens we built, so the seam between our product work and the in-house team's chain work had to be invisible.
That is why the craftsmanship mattered. Connecting a wallet their team had integrated, browsing a listing, completing a purchase: every one of those moments had to feel as unremarkable as logging into any well-built app. Unremarkable, in a market that volatile, was the highest compliment available, and it took two teams working one product to earn it.
04 Delivered in the window, honest about what came after
The outcome
The work was delivered in the window that mattered: a real marketplace product experience across web and mobile, built from late 2021 into 2022 while the NFT market was at its loudest, alongside an in-house team that kept full ownership of its chain layer throughout.
Then the market moved, and we frame what followed plainly. As the 2022 NFT and crypto contraction set in, the client slowed the project down and then suspended it; the delivered work was handed over. What the case proves has not aged, though. When your team owns the hardest layer of your product, you do not need to stretch it across the rest. Bringing in a team that treats the product experience as its own craft, and drawing the boundary honestly, is how two teams ship one product at speed.