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Information marketplaces enable entities to buy and sell information; these buying and selling entities can be humans, or automated agents that represent them. In this paper, we introduce a new type of participant into electronic information marketplaces, namely the InfoCenter agent, which can not only buy and sell information, but can also procure and sell manipulated (i.e., processed) information. We explore the e ects that InfoCenters have on the marketplace and on the other agents that participate in it. We show that the bene ts of extending an information e-marketplace with InfoCenter agents are twofold. First, InfoCenters can help buyers obtain better information; second, InfoCenter agents can help sellers gain higher pro ts. Furthermore, we empirically test the in uence of di erent pricing algorithms and payment methods on the buyers', sellers', and InfoCenters' behaviors.