Build a gambling Jackpot Website such as CSGORumble or CSGOLotto

We are looking for a website that works like [login to view URL] and [login to view URL] Briefly, users trade their in-game items to our bots, script is merging them and randomly selects one winner. Chance of winning depends on general price of all one user's traded items. The users must be able to login with their steam accounts which then makes them link their trade URL in order to trade freely with out bots.