Methods, mediums, and systems are described for providing a platform coupled to one or more rules engines. The platform may provide runtime rule services to one or more applications. Different rules engines may be used for different types of rules, such as calculations, decisions, process control, transformation, and validation. Rules engines can be added, removed, and reassigned to the platform. When the platform receives a request for services from an application, the platform selects one of the rules engines to handle the request and instructs the selected rules engine to execute the rule. The rules engine may be selected automatically. The platform may be implemented through a service-oriented architecture.