Usage: 2 forms in 2 verses
Form Translated As     In Verse(s)
ανταλλάξεται bargain LXX.Prov.6.35
ανταλλάξει he shall not bargain LXX.Job.37.4

Liddell-Scott-Jones

ἀνταλλάσσω (antallassō) to bargain G:V

ἀνταλλάσσω-σσω,

Attic dialect ἀνταλλάσσωττω, exchange one thing with another, δάκρυα δ᾽ ἀνταλλάσσωσσετε τοῖς τῆσδε μέλεσι[Refs 5th c.BC+]; τὴν ἀξίωσιν τῶν ὀνομάτων ἐς τὰ ἔργα . they changed the signification of the names in relation to things, [Refs 5th c.BC+]

__II more frequently in middle, take in exchange, ἄνδρα[Refs 4th c.BC+]; ἀνταλλάσσωσσεσθαί τί τινος take one thing in exchange for another, [Refs 5th c.BC+]; ἀνταλλάσσωσσεσθαι τῇ διανοίᾳ interchange in thought, [Refs 5th c.BC+]; θάνατον ἀνταλλάσσωξεται shall receive death in exchange, i.e. as a punishment, [Refs 5th c.BC+] —so in passive, ἀντηλλαγμένου τοῦ ἑκατέρων τρόπου having made an interchange of each other's custom, i.e. having each adopted the way of the other, [Refs 5th c.BC+]
__II.2 give in exchange, μηδεμιᾶς χάριτος μηδ᾽ ὠφελίας τὴν εἰς τοὺς Ἕλληνας εὔνοιαν[Refs 4th c.BC+]