Currently, mostly buying currency in Mir4. Apparently, you're going to be able to buy and sell characters soon. Mir4 you can mine currency in game and convert it to crypto or vice versa. So, I did the latter. That took two exchanges, multiple wallets, and multiple days for a less than $50 purchase.

The other games I've tried (Gods Unchained, Axie Infinity, MyCryptoHeroes, Splinterlands, Sorare) are either too expensive or not fun.

Augur (prediction market) is pretty interesting, but it's off limits in my region. It's also Ethereum based, so high transaction fees.

I've also bought a few pizzas, gift cards, domains, supplements, VPN access, that sort of thing as well. I still check for a crypto option at most places I shop (including SaaS services), but I don't see it most of the time.