Cell autonomous antagonist of the canonical Wnt signaling pathway. May activate a second Wnt signaling pathway that controls planar cell polarity. {ECO:0000269|PubMed:11752446, ECO:0000269|PubMed:15687260, ECO:0000269|PubMed:16567647}. This is the function of Ensembl gene identifier ENSG00000140807 (NKD1, NKD inhibitor of Wnt signaling pathway 1).