Okla. Stat. tit. 12, § 12-729.9: Rate of exchange

The rate of exchange prevailing at or near the close of business

on the day the distribution proceeding is initiated governs all

exchanges of foreign money in a distribution proceeding. A foreign-

money claimant in a distribution proceeding shall assert its claim

in the named foreign money and show the amount of United States

dollars resulting from a conversion as of the date the proceeding

was initiated.