Abstract: A system and method of providing data exchange between an aggregate transaction engine and multiple sources. The system may include an aggregate transaction engine including a user interface server, a source interface server, and a transaction server. The source interface server may include data scraping protocols, electronic data interface protocols, and database query protocols for communicating with the multiple sources. The aggregate transaction engine may include a search module for accessing data describing at least one offering available from the multiple source systems. The aggregate transaction engine may include an ordering module for placing a plurality of orders to the multiple source systems in response to an ordering transaction from a user. The search module and ordering module may include predefined data transfer protocols customized for communicating with the particular source system.