He's been optioned to Triple-A Pawtucket. To make room on the 40-man roster, the team moved reliever Scott Atchison to the 60-day disabled list (right elbow strain).
The 25-year-old, Dominican-born Beato has split his season between the Mets and Triple-A Buffalo. In seven appearances at the major league level this season, Beato is 0-0 with a 10.38 ERA in 4 1/3 innings.
His last outing with the Mets was his worst. He surrendered four runs in just 1/3 of an inning on July 23 and was sent to Triple-A the next day. In his past three appearances at the Triple-A level, Beato has surrendered 10 runs in five innings.
He pitched 67 innings for the Mets in 2011, with a 4.30 ERA and a 2-1 record.