I’ve been thinking about value of your app for several days and you know I’ve realized that your app is something that every trader really must have. Cryptocurrencies (especially BTC) are assets that traders use for holding/trading because they’re very volatile. Day by day traders come to understanding that’s no use to withdraw all BTC (for instance) they possess on fiat, but only the amount they need for life. Your application can give traders an opportunity to exchange small amount of BTC (or any other crypto) on fiat they need (quickly and with low fees) and to spend those money in shops while their main assets will still be at their wallets and continue to bring profit. If this is what you finally will provide, your application will become very popular. You need to do a lot of work for everything to work. Good luck!