Calcium-dependent nucleotidase with a preference for UDP. The order of activity with different substrates is UDP > GDP > UTP > GTP. Has very low activity towards ADP and even lower activity towards ATP. Does not hydrolyze AMP and GMP (PubMed:12234496, PubMed:15006348, PubMed:15248776, PubMed:16835225). Involved in proteoglycan synthesis (PubMed:22539336). {ECO:0000269|PubMed:12234496, ECO:0000269|PubMed:15006348, ECO:0000269|PubMed:15248776, ECO:0000269|PubMed:16835225, ECO:0000269|PubMed:22539336}. This is the function of ENSG00000171302 (CANT1, calcium activated nucleotidase 1).