In the Lobby, you can determine the currency of a Contest by looking at the very right side of the tile for the listing of the contest.
OwnersBucks contest will display in blue font with an OwnersBucks icon, whereas real-money contests will display in green font with a dollar sign ($).
You can also filter contests between real-money and OwnersBucks.
For Web:
Across the top of the Lobby, you will find the filter section. To filter by real-money (USD) or OwnersBucks you would use the options under the "Entry Type" header.
For Mobile:
Tap "Lobby" in the bottom navigation bar and then tap "Filters" at the top. For the menu that slides in, you will have options under "Entry Type".
