MeconCash is a cryptocurrency used for payment method, settlement, and reward in online and mobile service. It adopts blockchain technology for technical superiority and high-level security. The MeconCash system is composed of the blockchain area, which saves smart contracts; a payment ledger; and the service area, which implements an actual service using the OPEN API and API that connect the blockchain area with the actual service. The service area is operated in the form of individual services, but for the M.PAY reward and the payment, it is operated in connection with the API, and each service is integrated and operated in the management system.