We study algebras and correlation functions of local operators at half-BPS interfaces engineered by the stacks of D5 or NS5 branes in the 4D [Formula: see text] super Yang–Mills. The operator algebra in this sector is isomorphic to a truncation of the Yangian [Formula: see text]. The correlators, encoded in a trace on the Yangian, are controlled by the inhomogeneous [Formula: see text] spin chain, where n is the number of fivebranes: they are given in terms of matrix elements of transfer

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... s associated with Verma modules or, equivalently, of products of Baxter's Q-operators. This can be viewed as a novel connection between the [Formula: see text] super Yang–Mills and integrable spin chains. We also remark on analogous constructions involving half-BPS Wilson lines.