K-theoretic Donaldson-Thomas counts of curves in toric threefolds can be computed in terms of a certain canonical 3-valent tensor, the K-theoretic equivariant vertex. In this talk an explicit formula for the capped vertex in the case when two out of three entries are nontrivial will be presented along with some applications of this result. Based on a joint work with Yakov Kononov and Andrei Okounkov