Arizona-based ReplyBuy enables Boston Celtics fans to opt into an on-demand ticket program through text messaging. Fans provide the team with contact and credit card information and the team texts ticket offers. Fans reply to offers with a short code and receive a ticket purchase confirmation in seconds. Launched in November 2014, ReplyBuy may be the fastest-growing sports ticketing company, and already has signed deals with the Los Angeles Clippers, Cleveland Cavaliers, Washington Wizards, Brooklyn Nets, Detroit Pistons, Minnesota Timberwolves, and the Celtics. "This is the Uber for ticketing," says the Celtics' Shawn Sullivan. "You put in your info and when we have Celtics tickets, we will find you." Ticket providers with leftover tickets can reach out to fans in the area who might not otherwise know tickets are still available. "There was just so much fragmentation in mobile and we thought why shouldn't we use the most universal form of communication on the planet—a text message—and let fans complete a transaction," says ReplyBuy co-founder Josh Manley. "It's conversational commerce."