Disclosed are various embodiments for automated service interface optimization. A plurality of usage metrics for at least one service client corresponding to a set of data items within a data object are determined in at least one computing device. The data object is obtainable by at least one service client from a service provider. The service provider is configured to provide an optimized data object to the at least one service client. The optimized data object includes a proper subset of the set of data items. The proper subset is determined based at least in part on the usage metrics.