The pair or coin type does not matter, as long as you can inter-exchange it. Like Btc/Usd, Ltc/Usd and Ltc/Btc. You can exchange those inside an triangle setup and that is how it works. You can control the pairs which are used and the trigger percentage, the logic inside the bot will check all the possible routes for you and triggers when the given profit are found.

All bots are taking the fee in account, but they also do an little bit more. They also watch the orderbook (aka the price spread) in order to see if an trading route will be profitable or not.

BTW Do not focus yourself to much on arbitrage, sure it looks interesting and this indeed works. But the real profit numbers are made with the trade-bots trading on an leverage or by alt-coin investments.

BTW To all users, if you read this are you are NOT running version 3 already please go to our forum (https://forum.haasonline.com/) and grap this amazing version. Its an full rewrite of the software, running very high-end and for the current moment we are doing the final tests runs. We are having an look if it works for everybody and if it does, then the release will follow soon. But before this time all features are enabled on all licenses "so it can be tested". Take your advantage out of this!