Trading fee is 0.05%
For Btc that is 15usd per btc atm
So will rebalance if gain is 3usd
And we will pay fee 15usd
Rebalance means it sell A buy B.
or buy A sell B
if A rise +3$, A will sold the +3$ and buy 3$ to B
it’s not selling the whole coin you have. read the article on pionex web for better understanding