Visa Inc. and Mastercard Inc. fell, with Visa slipping as much as 7.1% and Mastercard dropping as much as 6.2%. Both declines were the biggest for the shares of companies since April. Meanwhile, Amazon.com Inc. and Walmart Inc. are among large multinational companies which have recently discussed issuing their own stablecoins in the US, the Wall Street Journal reported, citing unidentified people. Bloomberg's Michael Regan has more on the story.