StockX is a marketplace where Buyers and Sellers can make anonymous offers on a wide variety of current culture items such as sneakers, streetwear, electronics and collectibles, based both on the item's current valuation on the site, but also how much you're willing to sell it for. StockX's anonymous nature aims to make buying and selling a hassle-free experience: Buyers see the lowest available sale price, and Sellers see the highest available buying offer.

Since both Buyers and Sellers can set their respective offers, a sale on StockX doesn’t begin until a Seller and a Buyer agree on a price through a Buyer's Bid matching a Seller's Ask or vice versa. You as a Seller have two ways to match with a Buyer on StockX, through utilizing the “Sell Now” and “Ask” features.