this invention is a system and method for determining revenue from an intermediary derived from end user interactions involving personal information via the intermediary . a host computer monitors interactions between end users and personal information providers via an intermediary computer . the host computer communicates with a personal information store for storing personal information associated with end users and an accounting store for storing accounting data associated with the intermediary computer . the host computer includes a processor that receives requests concerning personal information from the intermediary computer and services these requests based on personal information in the personal information store . the host computer processor updates the accounting data associated with the intermediary computer and generates invoices to the intermediary computer based on the updated accounting data .