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In page Phosphatase:

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A nucleotidase is an enzyme that catalyzes the hydrolysis of a nucleotide, forming a nucleoside and a phosphate ion.[1] Nucleotidases are essential for cellular homeostasis, because they are partially responsible for maintaining a balanced ratio of nucleotides to nucleosides.[2] Some nucleotidases function outside the cell, creating nucleosides that can be transported into the cell and used to regenerate nucleotides via salvage pathways.[3] Inside the cell, nucleotidases may help to maintain energy levels under stress conditions. A cell deprived of oxygen and nutrients may catabolize more nucleotides to boost levels of nucleoside triphosphates such as ATP, the primary energy currency of the cell.[4]