Dephosphorylates the phosphotyrosine-containing proteins YwqD, YwqF and Ssb. H2O + O-phospho-L-tyrosyl-[protein] = L-tyrosyl-[protein] + phosphate Inhibited by vanadate and sodium pyrophosphate. Not inhibited by sodium fluoride. Optimally active at alkaline pHs. Activity increases with increasing pHs. Belongs to the metallo-dependent hydrolases superfamily. CpsB/CapC family.