Mo. Rev. Stat. § 429.490

Whenever any debt, which is a lien upon any building or other improvement, shall be paid and satisfied, the creditor, if required, shall file an acknowledgment of such satisfaction with the clerk of the circuit court, which satisfaction shall be certified by the clerk to the secretary of state within ten days after the same has been entered upon the records in his office; and the clerks of the circuit courts and the secretary of state shall receive as full compensation for services performed by them as is provided for under this chapter for mechanics' liens.