To provide a
system, a method, and a device for automatically executing an activity based on a loan.SOLUTION: A loan platform to start an automated loan action, includes a block chain service circuit that interprets an
access control function corresponding to a party related to a loan, a data collection circuit that interprets entity information, a
smart contract circuit that designates a loan condition, and a loan management circuit. The loan management circuit interprets a loan-related event in accordance with the entity information, a plurality of the
access control functions, and the loan condition, and implements the loan-related activity. In order to facilitate communication among the circuits in a
system, each of the block chain service circuit, the data collection circuit, the
smart contract circuit, and the loan management circuit further includes the corresponding
application programming interface (API) component.SELECTED DRAWING: Figure 51