[caslon]

That doesn't mean people aren't stupid, in contrast to what you implied in another comment. Unwittingly day-trading cryptocurrency is stupid, and the people who desire to do it are not very smart.

That said, I do know a decentralized exchange that fits your criteria. I'm not going to mention it, because I refuse to enable such incredibly harmful behavior.

[viraptor]

I don't believe anyone is "unwittingly" day trading anything. You're quite aware of doing it - it takes time.