I thought about including the fees, but I felt that would be too many input parameters to adjust, making the tool more unwieldly. It's easy enough for users to check the fees on their own and subtract them out from the cost and expected payout.

I don't know of Predyx has an API, but a cool thing would be if the user could simply enter the URL of the market and have all the parameters auto-filled. @mega_dreamer @Team_Predyx