18 U.S.C. § 3195: Payment of fees and costs

All costs or expenses incurred in any extradition proceeding in apprehending, securing, and transmitting a fugitive shall be paid by the demanding authority. All witness fees and costs of every nature in cases of international extradition, including the fees of the magistrate judge, shall be certified by the judge or magistrate judge before whom the hearing shall take place to the Secretary of State of the United States, and the same shall be paid out of appropriations to defray the expenses of the judiciary or the Department of Justice as the case may be. The Attorney General shall certify to the Secretary of State the amounts to be paid to the United States on account of said fees and costs in extradition cases by the foreign government requesting the extradition, and the Secretary of State shall cause said amounts to be collected and transmitted to the Attorney General for deposit in the Treasury of the United States.