Slapwars is an online sticker wall. Anyone can post a digital sticker (a name or logo, with an optional link) for free. Paid features are digital only: prepaid credit packs and top-ups spent on extra sticker placements and effects on the wall ($1 to $5 each), a $250 one-off "blast" effect, and weekly auctions for three featured spots on the wall. An auction bid is a card authorization; only the winning bid is captured when the auction closes each Sunday, and outbid holds are released.