Stimulates decapping of both stable and unstable mRNA during mRNA decay. Stimulates decapping presumably by preventing the DCP1-DCP2 decapping complex from adopting an inactive conformation. Homodimer (By similarity). Interacts with dcp2. Is concentrated in several cytoplasmic foci called P bodies (or cytoplasmic processing bodies) which represent sites of mRNA decapping and 5' to 3' exonucleotidic decay. Belongs to the EDC3 family.