StockX is a marketplace where Buyers and Sellers can make anonymous offers on a wide variety of shoes, streetwear, electronics and collectibles, based both on the item's current valuation on the site, but also how much you're willing to pay for it or 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. 

As a Buyer, you have two ways to match with a Seller on StockX—through utilizing the “Buy Now” and “Bid” features.