The invention provides a method, business method, and system for conducting micropayment transactions between consumers and merchants. A merchant offers micropayment transactions to a consumer. The micropayment transaction is authorized, and the micropayment transaction is executed between the merchant and the consumer. A value parameter associated with a prepaid instrument, such as a prepaid calling card, is decremented by an amount corresponding to the value provided by the merchant. A payment is transferred to the merchant to settle the micropayment transaction. The invention also provides a system for conducting micropayment transactions between consumers and merchants. At least one prepaid calling card is issued to a consumer in exchange for a payment from the consumer. A merchant site conducts micropayment transactions and accepts the prepaid calling card as payment. A clearinghouse receives data associated with the prepaid calling card from the merchant site and processes the data to settle the micropayment transaction. The invention also provides a business method for conducting micropayment transactions between consumers and merchants.