The Board of Directors of U.K.-based Earthport, a provider of cross-border payment, money transfer, and foreign exchange services, has accepted a $305.4-million (£233-million) all-cash buyout offer from Mastercard, days after accepting a buyout offer from Visa. Earthport’s board had been scheduled to vote February 21 on Visa’s all-cash offer, which was valued at $259.5 million (£198 million). Earthport stock trades under the symbol EPO on AIM, the London Stock Exchange’s secondary market. When Visa made its bi...