Every exchange minimum trade restrictions.
Due to these restrictions, it helps having a larger portfolio size. The larger your portfolio, the closer HodlBot will be able to match your composition with your target portfolio.
Recommended Account Size
Each portfolio has an implicit recommended account size. When you are trying to switch between exchanges, HodlBot will alert you if you are under the recommended amount.
The minimum recommend amount is based on the smallest allocation in the target portfolio, and seeing how much funds is required to pass minimum trading limits.
Binance Minimum Trading Limit
Binance's minimum trading limits can be found here.
Kraken Minimum Trading Limit
Kraken's minimum trading limits can be found here.