Listia is a free online marketplace and mobile app for trading goods between individuals without using money. The platform has a system known as Listia credits to facilitate the trades. Users earn credits for giving away items they no longer need and can then use credits to get items that other users have listed. The marketplace uses an auction system where users bid on each other's items until the auction ends and the highest bidder wins. The user who listed the item then arranges for a pickup or ships the item directly to the winner.