I need a platform for copy trading , meaning that I got few people wanting to give me their funds.
Probably would be better off i'm just able to trade on their accounts from one place (no direct access to their exchange accounts).
That's what we called in trading, "API". That is the acronym of Application Programming Interface which is a Microsoft Windows platform that you can able to access the trading activity but not the fund who deposited by the account owner of an exchange, as what explained very well above by @GreatArkansas.
There are too many exchanges that offer this kind of service feature, and most commonly those are free. But it seems you are talking about copy trading, they are different feature of API and copy trading. Here is the list of
Top 10 Best Crypto Exchange and for copy trading exchange, that's another story.