With the Bounty Hunters plugin, you can place a bounty on a player’s head. After the bounty is placed it will be announced to the server and placed on the bounty list for all players to see. Every time the player joins the server their bounty is announced. When a player kills a player who has a bounty they collect the bounty payment.
To place a bounty on a player you will need to run the following command.
/addbounty <player> <amount> sets a bounty on a player.
To see the list of all bounties, run the following command.
/bounties will open the bounties GUI
To see the hunter leader board, run the following command.
/hunters will open the hunter leader board