A funds-transfer system includes a processor and a memory storing control logic for causing the processor to enable a buyer to transfer funds to a seller via a mobile telephone. The control logic includes program code for causing the processor to receive a payment request transmitted from a mobile telephone of the buyer. The payment request is for a transfer of funds from a financial account held by the buyer to a financial account held by the seller, and the payment request is transmitted from a payment application stored in the buyer's mobile telephone. The payment request identifies a purchase amount to be transferred, and information identifying the financial account held by the buyer. The control logic also includes program code for causing the processor to charge the purchase amount to the financial account held by the buyer and to transfer the purchase amount to a financial account held by the seller. Additionally, the control logic includes program code for causing the processor to provide a payment acknowledgment to the buyer's mobile telephone and to the seller.