An invention is disclosed relating to an apparatus and method for hosting transactions over a network such as the Internet. Sellers post offers to sell under a listing belonging to an organized database of listings. Likewise, buyers post offers to buy. A matching module selects offers to sell and matches them to offers to buy based on a predefined criteria. Before posting offers to sell or buy, buyers and sellers may be presented with data concerning the market for the product that is the subject of the offer. A sale is consummated between the buyer and seller of the matched offer to buy and offer to sell. Consummation may include assessing the risk of fraud posed by the matched buyer and matched seller. Fees may be charged to the matched buyer, the matched seller, or both as insurance against fraud. Payment may be made by the buyer directly to the seller or to a host hosting the apparatus and method for conducting the transaction. Payment is forwarded to the seller by the host upon confirmation by the buyer that a product has been received in good order. An automated, or partially automated, dispute resolution process may resolve disputed transactions.