I'll play but let's not use an alt coin for this tourney. I don't really like using an exchange for a small trade and losing out on the fee. Maybe you could offer multiple buy in options. Btc, Ltc, usdt or something and winners can discuss how they want paid. IDK just an idea.
Solana fee is 0.15-0.20 usd. I don’t see where you lose out on fees. Before lightning network got implemented btc had the worst fees. I think a multiple payment option choice would be the best pick.