[1] In 2018, he split time between the rookie–level Kingsport Mets and Low–A Brooklyn Cyclones, making 12 appearances (11 starts) and recording a 3.86 ERA with 55 strikeouts in 60+2⁄3 innings of work.

[6] Buttó was assigned to the Double–A Binghamton Mets to begin the 2022 season, and posted a 6–5 record and 4.00 ERA with 108 strikeouts across 20 games (18 starts).

[7] On August 21, 2022, Buttó was promoted to the major leagues for the first time, to make a spot start against the Philadelphia Phillies.

[12] He returned to the major leagues several times across the season, with his longest stay coming after the September roster expansion.

[13] Buttó was again optioned to Triple–A Syracuse to begin the 2024 season after he was beaten out by Tylor Megill for the final rotation spot.