Disclosed are systems, methods, and non-transitory computer-readable media for message routing optimization. The message routing optimization system receives requests to transmit messages to recipient devices. The message routing optimization system determines whether to allocate the messages to an optimal routing provider or a secondary routing provider. The message routing optimization ranks the set of routing providers based on a conversion rate index and determines the optimal routing and secondary routing providers based on the ranking. The message routing optimization system allocates messages to the selected routing providers to be delivered to their intended recipients.