Steroid phosphatase which catalyzes the conversion of inactive phosphorylated ecdysteroids into their active forms (PubMed:12721294, PubMed:18937503). Shows high activity towards ecdysone 22-phosphate (E22P) (PubMed:12721294). Has lower activity towards other ecdysteriod phosphates including 20-hydroxyecdysone 22-phosphate (20E22P) and 2-deoxyecdysone 22-phosphate (2dE22P) (PubMed:12721294). Also has protein tyrosine phosphatase activity (PubMed:18937503). ecdysone 22-phosphate + H2O = ecdysone + phosphate 20-hydroxyecdysone 22-phosphate + H2O = 20-hydroxyecdysone + phosphate 2-deoxyecdysone 22-phosphate + H2O = 2-deoxyecdysone + phosphate H2O + O-phospho-L-tyrosyl-[protein] = L-tyrosyl-[protein] + phosphate Competitively inhibited by 4-nitrophenyl phosphate (para-nitrophenylphosphate, pNPP) (PubMed:12721294). Also inhibited by tungstate, vanadate, and phosphate (PubMed:18937503). kcat is 0.94 sec(-1) for E22P. kcat is 14.57 sec(-1) for 20E22P. kcat is 3.53 sec(-1) for 2dE22P. kcat is 0.14 sec(-1) for 22d20E3P. Optimum pH is 7.5. Homodimer. Detected in non-diapause eggs, with highest expression between 2 and 5 days after oviposition. Not detected in other tissues tested.