N.D. Cent. Code § 40-31-09
All curbing assessment warrants shall be payable as specified and in such amounts as in the judgment of the governing body will be provided by the taxes and assessments. The warrants shall bear interest at a rate or rates and be sold at a price resulting in an average net interest cost of not more than twelve percent per annum on those issues sold at private sale. However, there is no interest rate ceiling on warrant issues sold at public sale or to the state of North Dakota or any of its agencies or instrumentalities. The warrants may have coupons attached representing each year's interest. The warrants shall state upon their face the purpose for which they were issued and the fund from which they are payable and shall be signed by the executive officer of the city and countersigned by the city auditor under the seal of the city. The warrants may be used in making payments on contracts for making the improvements or may be sold for cash at not less than ninety-eight percent of the par value thereof and the proceeds credited to the special fund and used to pay for such improvements.
N.D.C.C. § 40-31-09