Ebay Inc. /zigman2/quotes/204653455/composite EBAY -2.30% said Tuesday that it is expanding its "Authenticity Guarantee" to trading cards. The e-commerce site will start with trading cards sold for $750 or more by mid-2022, and will extend the guarantee to those sold for $250 or more after that. The service also includes handbags sold for $500 or more, watches sold for $2,000 or more, and sneakers sold for $100 or more. Trading cards are one of eBay's top selling categories, with $2 billion in transactions for the first half of 2021. Cards put through the authentication process will receive a unique QR code to affirm its resale value. Ebay stock is up 4.2% over the past year while the S&P 500 index /zigman2/quotes/210599714/realtime SPX -1.35% has gained 14.4% for the period.