Ok this is awesome, and I know how to do it though,
The problem is how to transfer back to the cheaper exchange to continue the process again and again?
That's the simple key, which is the best way to transfer back?
You can wait for the spread to shrink, take small loss and go back. Alternatively, take market risk..( I wouldn't recommend this option if you're not a seasoned day trader).
Arbitrage is not a stand alone business model, instead it can be referred to as one of the trading strategies. If you're an ambitious trader, or studying to become one, this tool without a doubt will raise your chances for long term success.
If you don't know what the hell you're doing, I would recommend against
https://www.arbitrage.expert