S.D. Codified Laws § 4-6-16
The state treasurer shall prepare specifications and select successful bidders for a period not to exceed three years to act as active depositories for the collection of drafts, checks, certificates of deposit, or coupons that may be received by the state treasurer on account of claims due the state, in which may be maintained active checking accounts. The state treasurer may negotiate with the successful bidder to continue such depositories for two years beyond the initial three. The state treasurer, on receipt of any draft, check, or certificate of deposit on account of state dues, may place the same in such active depository for collection and the active depository may collect the same without delay. The interest to be paid by such active depository shall be fixed by the state treasurer.
SDCL 4-6-16