The Mets placed Kay on outright waivers Friday, Anthony DiComo of MLB.com reports.
Kay will join five other Mets players on the waiver wire in an effort from the team to clear space on the 40-man roster. The 28-year-old southpaw put up a 6.14 ERA and 1.50 WHIP across 14.2 innings between the Cubs and Mets.