I’ve responded to this through support ticket. I suggested that you directly use IFTTT to send web request to OpenSprinkler, this way you can avoid having to use ThingSpeak to send web request. Not sure if this would meet your need, but the idea is that IFTTT can receive data from ThingSpeak as ‘trigger’, and send command to OpenSprinkler as ‘action’. The latter can be done using ‘webhook’ that IFTTT supports.