Abstract: A computer-implemented method and system for keyword bidding are disclosed. A particular embodiment includes identifying a keyword searched by a buyer on a host site just prior to their purchase transaction; recording a host site category associated with the purchase transaction; correlating the keyword with the host site category; determining a revenue per click value associated with the keyword; obtaining bidding information associated with the keyword; and automatically generating a bid value for the keyword based on the revenue per click value, the bidding information, and the host site category.