Enables RNA NAD-cap (NMN-forming) hydrolase activity; magnesium ion binding activity; and zinc ion binding activity. Involved in NAD-cap decapping; circadian regulation of gene expression; and mRNA catabolic process. Predicted to be located in cytoplasm and nucleus. Predicted to be active in peroxisome. Is expressed in eye. Orthologous to human NUDT12 (nudix hydrolase 12). [provided by Alliance of Genome Resources, Apr 2022]