Is Forex permissible if it is free from margin interest and overnight fees, and transactions are executed instantly within the bank?

It is forbidden to deal with the margin system if the broker stipulates to the client that his buying and selling must be through him, so that the broker benefits from the commission, even if no interest is calculated. This is due to the Lawgiver's prohibition of "a loan and a sale" simultaneously. It is permissible to deal with the forex system if a lender is found who does not stipulate that dealings be through him, and a constructive or actual possession occurs at the contract session of the deal.