Arbitrage

I hate being so retarded

what could go wrong is you deposit on the exchange that is more expensive, but by the time the dollar deposit actually goes into your account the price is EXACTLY the same

so you need to probably keep some ETH and dollars on both and just wait for a long-ass time for them to diverge to do it

I just made 50 bucks doing exactly that yesterday. Yes it is easy if you move fast, because you're not the only one that will do it.

transaction speed also