While building it, I ran into a fundamental question:
💬 Are people even interested in spending their crypto?
Yes. Indeed they are. But this does not mean they will ALWAYS spend their Cryptocurrencies.
One thing you should note is that the Bitcoin market is not very stable and rarely enters bull runs. Although bull runs have historically been highly profitable, them being a relatively rare occurrence means people will likely spend only then while finding themselves in an accumulation or recovery stage during the rest of the time.
Altcoins are even worse. Most of them at least. Compared to Bitcoin, they rarely produce more profit during the longer term. However, many of them are what I would call 'one time risers'. They rise only once but by an incredible percentage, then they fall and collapse while all the investors who put their money during the spike are wrecked.
If I put 100 dollars in Bitcoin and it becomes only 90 dollars in a matter of an year due to the Bitcoin being in a relatively bearish market, I would obviously rather not spend it. If it then spikes from 90 to 500, I may decide to finally buy the new product I kept waiting to afford.
But if I put 100 dollars in an Altcoin, it often either becomes almost nothing, it becomes worth less or there are extremely rare occurrences where you find yourself in the middle of a one time riser during its spike. It can become 1000 dollars in a week, or a day even.
However. Keep one thing in your mind. A lot of people never really spend because they see how much they made, 100 to 1000 or 90 to 500 in a really short time span and they think this is their time to become rich. And at the end of this waiting, they find themselves now only owning 180 instead of 500 in Bitcoin or 80 instead of 1000 in Altcoins. So they wait, hoping to recover their paper loss. And it often never happens, so they sell. And so on.
To end the story time quicker, while we do intend to spend our Cryptocurrencies, we are often emotionally and mentally stuck not knowing what to do next and realistically speaking, you can not and should not expect a VERY large volume on a Cryptocurrency shopping platform. Business wise, it may be a good idea to integrate Fiat as a payment method as well. Maybe allow customers to pay partially in Cryptocurrency and the rest in Fiat even. I rather see a platform that succeeds with both methods integrated than yet another platform that shuts down after an year of operation due to a lack of volume or interest.