Yes, that is a totally ginormous sum, and you are reading it right: XPRT Ventures has filed a $3.8 billion suit against EBay Inc, along with affiliates PayPal, Bill Me Later, Shopping.Com and StubHub, for infringing on six patents related to PayPal and other payment systems. Not only did EBay use XPRT's technology, the suit claims, but knowingly implemented it in their own patent application, "Method and System to Automate Payment for a Commerce Transaction." Also, remember when you used to buy a bunch of stuff on eBay? [Reuters via Business Insider]