Hydrolyzes dalpatein 7-O-beta-D-apiofuranosyl-(1->6)-beta-D-glucopyranoside and dalnigrein 7-O-beta-D-apiofuranosyl-(1->6)-beta-D-glucopyranoside. Also has activity towards pNP-beta-D-fucoside and pNP-beta-D-glucoside, but not pNP-beta-cellobioside. 7-[beta-D-apiofuranosyl-(1->6)-beta-D-glucopyranosyloxy]isoflavonoid + H2O = a 7-hydroxyisoflavonoid + beta-D-apiofuranosyl-(1->6)-D-glucose. Not inhibited by iron, calcium, mercury, manganese, zinc or EDTA. Optimum pH is 5.0-6.0. Half maximum activity is seen at pH 3.5 and 6.5. Optimum temperature is 65 degrees Celsius. Homotetramer. Belongs to the glycosyl hydrolase 1 family.