You can use PlaceholderAPI to get placeholders from DeluxeCoinflip. You do not need an external PlaceholderAPI expansion to use these.
%coinflip_games_played% - Total number of games played.
%coinflip_wins% - Number of games won.
%coinflip_losses% - Number of games lost.
%coinflip_win_percentage% - Percentage chance of winning based on previous win to loss ratio.
%coinflip_profit% - Total profit earned from wins.
%coinflip_profit_formatted% - Beatified profit earned from wins (e.g. 3,000,000).