Mo. Revised Statute § 190.055

4. Each board member may receive an attendance fee not to exceed one hundred dollars for attending each regularly or specially called board meeting. Such member shall not be paid for attending more than two meetings in any calendar month, except that in a county of the first classification having a charter form of government, such member shall not be paid for attending more than four such meetings in any calendar month. In addition, the chairman of the board may receive fifty dollars for attending each regularly or specially called board meeting, but such chairman shall not be paid the additional fee for attending more than two meetings in any calendar month.