Wikipedia:REWARDS

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 * Barnstars - informal rewards given by one editor to another
 * Reward board (a.k.a. WP:REWARD) - informal rewards (including barnstars, exchanged labor, prizes, even cash) offered by one editor to others in exchange for on-Wikipedia work, such as advancing an article to Good Article status, providing a needed image of an article subject, finding a lost reference, etc.
 * Bounty board - essentially the same as the Reward board, except that the offerer makes a donation to the Wikimedia Foundation in exchange for your labor instead of offering a personal prize