I would like to inform you that there is already a platform on which you do not pay any type of fee in purchase, sale, deposit and withdrawal transactions, not even miners' fees.
when creating the account, the client still receives 10,000 Satoshis in his account and receives 7 days of free access to the trading tools.
the platform is excenbit and I am the representative of excenbit.
as for security, the funds are stored cold and the other part is an isolated server that has 4 layers of encryption.
any doubt can speak excenbit has a group on the telegram.