Available placeholders for 1.2.0 OpEconomy version:

%opeconomy_money_<player_name>% - That placeholder gets money of a player name entered in <player_name>.
%opeconomy_money% - This placeholder gets money of player that is on
%opeconomy_baltop_number_<number>% - It's getting player name from Baltop position
%opeconomy_baltop_player_position_<player_name>% - It's getting position from player name
%opeconomy_baltop_player_position% - Getting position of player
%opeconomy_currency% - Shows active currency that is used
%opeconomy_is_active_code_<code>% - Returns true/false if code is active
%opeconomy_max_uses_code_<code>%- Shows max uses for code
%opeconomy_uses_code_<code>% - Shows current uses for code
%opeconomy_reward_code_<code>% - Shows reward for entering code

Example usage of placeholders:

In scoreboard plugin using %opeconomy_money% that will show current balance of player.
In scoreboard plugin using %opeconomy_baltop_player_position% to show baltop position
In everywhere using %opeconomy_currency% after showing money