According to the Elias Rankings, which Detroit Tigers Thoughts has posted, as of right now Oliver Perez has type A status.  However, Perez is right on the border and could potentially slip out if he really struggles down the stretch. 

Having a type A status means that, assuming the Mets offer Perez salary arbitration, the Mets will receive two picks in compensation for Perez.  The first pick would be the other team’s highest pick that is unprotected (picks 1-15 in the draft are protected), and the second pick is a sandwich pick between the first two rounds.  For a full explanation, head over to MLB Trade Rumors. 

As expected, Pedro Martinez has neither Type A nor Type B status, meaning the Mets will receive no sort of compensation should he sign elsewhere.