Mo. Rev. Stat. § 362.385
No bank or trust company shall pay any interest on any deposits of money, public or private, which are payable on demand, at a rate of interest in excess of the current rate of interest authorized by the laws of the United States of America or by regulations issued under authority of these laws, to be paid on the deposits by member banks of the Federal Reserve System or by banks or trust companies whose deposits are insured by the Federal Deposit Insurance Corporation; and no bank or trust company wherein any deposits of such moneys shall be made shall become obligated or liable on account thereof except for the safekeeping thereof and for the payment of the amount of the deposits with interest thereon, if any, lawfully payable under the provisions of this chapter.
§ 362.385, RSMo