Protein phosphatase involved in the dephosphorylation of AKT kinase family. H2O + O-phospho-L-seryl-[protein] = L-seryl-[protein] + phosphate H2O + O-phospho-L-threonyl-[protein] = L-threonyl-[protein] + phosphate Binds 2 divalent metal cations. Belongs to the metallophosphoesterase superfamily. CPPED1 family.