Abstract: Systems, methods, routines and/or techniques for time delay on services (e.g., verification services) that detect undesirable content are described. In some embodiments, a flexible verification service prevents users (e.g., hackers) from using the verification service “as an oracle” to predict whether the user's application or software program will be detected by the verification service. The verification service, after receiving a verification request from a client device, may delay or prevent the communication of a verification response to the client device. The verification service may evaluate a verification request to determine a level of risk associated with the request. The verification service may communicate an initial response to the client device that submitted the verification request. The verification service may eventually communicate the verification response to the client device, for example, after a period of delay.