Herbert Weir Smyth, A Greek Grammar for Colleges

““ἀργυρίου πρίασθαι ἢ ἀποδόσθαι ἵππον” to buy or sell a horse for money” P. R. 333b, ““Θεμιστοκλέα_ τῶν μεγίστων δωρεῶν ἠξίωσαν” they deemed Themistocles worthy of the greatest gifts” I. 4.154, ““οὐκ ἀνταλλακτέον μοι τὴν φιλοτι_μία_ν οὐδενὸς κέρδους” I must not barter my public spirit for any price” D. 19.223. So with τάττειν rate, μισθοῦν let, μισθοῦσθαι hire, ἐργάζεσθαι work, and with any verb of doing anything for a wage, as ““οἱ τῆς παρ᾽ ἡμέρα_ν χάριτος τὰ μέγιστα τῆς πόλεως ἀπολωλεκότες” those who have ruined the highest interests of the State to purchase ephemeral popularity” D. 8.70, ““πόσου διδάσκει; πέντε μνῶν” for how much does he teach? for five minae” P. A. 20b, ““οἱ Χαλδαῖοι μισθοῦ στρατεύονται” the Chaldaeans serve for pay” X. C. 3.2.7.

a. The instrumental dative is also used. With verbs of exchanging, ἀντί is usual (1683).