Federal Reserve Governor Christopher Waller said on Friday that stablecoins are a good thing for the U.S. payments system, but he doubts the financial system can support a large number of these assets. "I'll say I'm a personal, big advocate of stablecoins," Waller said at a New York Fed event. "I have been saying this for over three-plus years now, about how this could bring competition, efficiency and speed into the payments system." "Do I think there's going to be 100 stablecoins circulating