The site looks very good and easy to understand. Your site is clean and this is the thing I liked most.
I have bookmarked your site, so that I can check back frequently for a possible arbitrage.

But I'm just wondering about the fees for the two exchanges, because at the end I have to make some profit after paying all expenses.

Is it possible to show the profit percent after deducting all expenses?

Lets say I have selected BTC/USD to look for a arbitrage opportunity from any exchanges.
Then the result will show the profit/loss percent after deducting all the expenses.

And is it the last trade prices your site shows?