I believe you use APIs then somehow make some sort of bot with it. I am no arbitrage expert but that would be my first guess. Also you need to have a bunch of capital on exchanges in order to this, which means you have to be willing to risk a lot. Not sure if it is worth it for little timers, I would only suggest going for it if you have loads of money.
Hey, thanks for your advice, I'm into PHP programming and in theory, it doesn't look that hard.
It would require having equal amounts of USDT and equal amounts of one cryptocurrency in both exchanges, waiting for the pair to go up or down against the other exchange.
Then selling your currency in the most expensive one, at the same time that you buy the same amount in the cheapest...
I didn't try this in practice TBH but I think that a proper working bot should be 100% safe.
