Receptor for R-spondins that potentiates the canonical Wnt signaling pathway and acts as a stem cell marker of the intestinal epithelium and the hair follicle. Upon binding to R-spondins (RSPO1, RSPO2, RSPO3 or RSPO4), associates with phosphorylated LRP6 and frizzled receptors that are activated by extracellular Wnt receptors, triggering the canonical Wnt signaling pathway to increase expression of target genes. In contrast to classical G-protein coupled receptors, does not activate heterotrimeric G-proteins to transduce the signal. Involved in the development and/or maintenance of the adult intestinal stem cells during postembryonic development (By similarity). Rapidly and constitutively internalized to the trans-Golgi network at steady state. Expressed in the developing epithelial stem cells of the intestine. Expressed in the limb, tail and intestine by T3 during metamorphosis. Belongs to the G-protein coupled receptor 1 family.