A computer-implementable method and system for managing a mashup web-based community portal. A network-based community portal having a mashup platform integrated therewith can be provided and one or more pre-negotiated bartering agreements designated, in response to a particular user input by one or more users of the network-based community portal. A management module (e.g., a “Market Manager”) can be associated with the network-based community portal in order to permit the users of the network-based community portal to describe to the mashup platform the pre-negotiated bartering agreement(s), in order to permit the network-based community portal to manage the utilization of mashup applications associated with the mashup platform and one or more widget contained by the mashup applications.