Ineterst rate on cash holdings

As a system developer it migth be usefull sometimes to keep part of the portfolio invested in liquidity such as 1 month deposits. Do you offer this possibility ?

I assume you are talking about the C2 Simulated Model Account. The answer is: no, we do not currently support that in the simulation. Unused cash just sits as cash. Obviously in a real-life trading account, account holders may choose to do something else with the cash, such as buying a treasury security, or something else.