I hear that with BTC arbitrage, people make 20-25% per year.
What is the best way to do that?
Where did you heard that? There's no such. However, you can do that with trading.
I want the coins and funds remain in my own account while making arbitrage.
Is there a free open source robot that can do that - and any tips you have?
If I remain with reliable brokers - what are the additional risks?
Thank you.
If you do the trade, your funds that are on your account will be moved. Yes, the funds remains on your account but they're going to be moved into the actual trade. It's like you are betting to the market and you don't want your funds to be taken by the casino? It's the same with what you're thinking and it is impossible to just see your own funds remain there while doing the trades.