Okla. Stat. tit. 62 § 498.1
Bonds or other obligations of any type or character authorized and issued by counties, municipalities, and school districts, including, but not limited to, bonds or obligations issued pursuant to Section 15-101 of Title 70 and Section 738 of Title 19, public housing authorities created pursuant to the Oklahoma Housing Authorities Act, Sections 1051 et seq. of Title 63, or port authorities created pursuant to Section 1102 of Title 82, may bear interest at a rate not to exceed ten percent (10%) per annum, payable not more often than semiannually, without regard to the limitations in any other law, general or special, except the Constitution of Oklahoma, except that said interest rate limitations shall not apply to any bonds or other obligations purchased by the federal government or any agency thereof.
Okla. Stat. tit. 62, § 498.1