In the title mononuclear complex, [Ag(C(9)H(7)N(3)S)(2)]BF(4), the Ag(I) ion adopts a virtually linear coordination geometry [N-Ag-N = 178.06 (11)°] with the two ligands bound to the metal atom via the pyridine N atoms. The metal-coordinated pyridine rings are almost coplanar, making a dihedral angle of 1.5 (2)°, while the two pendent pyrazine rings are arranged on the same side of the N-Ag-N line. Along the a axis, the mononuclear coordination units are stacked with π-π inter-actions between the pyridine rings [centroid-centroid distance = 3.569 (4) Å], leading to infinite chains. The chains are inter-connected through inter-molecular N(pyrazine)⋯π(pyrazine) inter-actions forming layers parallel to the ab plane [N⋯centroid = 3.268 (5) Å]. These layers are further stacked along the c-axis direction, furnishing a three-dimensional supra-molecular framework with the tetra-fluoridoborate anions embedded within the inter-stices.