 In September 2018, Twilio announced they were acquiring Ytica, a Prague, Czech Republic-based speech analytics firm, for an undisclosed amount.In October 2018, Twilio announced they were acquiring SendGrid, a Denver, Colorado-based customer communication platform for transactional and marketing email, for $2 billion.Twilio uses Amazon Web Services to host telephony infrastructure and provide connectivity between HTTP and the public switched telephone network (PSTN) through its APIs.