Abstract: Methods, systems, and computer program products are provided for simulating fraud detection rules. The method includes: receiving user input including at least one proposed fraud detection rule in at least one input field of a user interface; simulating the at least one proposed fraud detection rule by: querying historical transaction data based on the at least one proposed fraud detection rule; and generating a simulation result for the at least one proposed fraud detection rule based on the queried historical transaction data; and displaying the simulation result on the user interface. The simulation result is displayed on the user interface asynchronously and in near real-time relative to receiving the user input.