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The title ion pair, C13H10N+·C6H3N2O4−, contains a protonated acridine cation and a 3-carboxypyrazine-2-carboxylate monoanion, which are linked together through O—H...O, N—H...O and weak C—H...O hydrogen bonds. These hydrogen bonds generate a C(10) chain graph-set motif. The crystal structure is further stabilized by extensive π–π stacking interactions between nearly parallel [dihedral angle = 1.21(2)°] acridine systems. The shortest distance between the centroids of the six-membered rings within the cations is 3.6315 (8) Å. In addition, C—H...π edge-to-face interactions are present.