So this is basically a brokerage. You let your customers trade with one another and you hedge their positions on the exchange. Meanwhile, you extract a spread from all transactions.
I will pass on this product, as I am developing my own web-based trading platform that actually sends orders to the market.
I don't mean this to say that your product will fail. This is basically the only way that consumer forex works on the market today. You will find plenty of happy customers. I just wish you would be a little more up front with the details of how this works since your customers are used to all orders going to the market.