Abstract: Products, goods or services are exchanged, traded or bartered through double-blind transactions facilitated by a network site. Proposed transactions are listed, offered and accepted by counter party users of the network site. Proposed transactions may include payment of money, in whole or in part, in addition to the exchange, trade or barter of products, goods or services. The exchange, trade or barter is facilitated by a third-party agent, which may provide ancillary products, goods or services, within the expertise of the agent. The network site or the agent may facilitate payment of money. Automobiles, jewelry, vacation rentals, and work on a house are some products or services that can be exchanged, traded or bartered. Coffee shops, libraries, auto dealers, travel agents, hardware stores, and lockers are some facilitating agents.