ἐγέγραπτο ὁπόσου ἡ καταλλαγὴ ἦν τῷ ἀργυρίῳ
From LSJ
τοῖς οἰκείοις βουλεύμασιν ἁλίσκεσθαι → hoist by one's own petard, hoist with one's own petard, hoist on one's own petard, hoisted by one's own petard, be hoist with one's own petard
there had been included in the bill what the rate of exchange was