An item may be purchased using a combination of rewards and monetary consideration, wherein a maximum allowable reward payment portion (or correspondingly a minimum monetary consideration amount) is established by the merchant, the reward issuer, or an online reward exchange operator. The user may select, using for example a user interface slider control, the desired number of rewards to redeem (up to the maximum allowable amount) and the corresponding monetary consideration portion is displayed. The transaction may then be executed wherein the selected rewards are redeemed and the balance is paid for with the corresponding monetary consideration.