In one aspect, a system includes a transaction handler to process transactions, a data warehouse to store transaction data recording the transactions processed at the transaction handler, a profile generator to generate a profile of a user based on the transaction data, an advertisement selector to identify an advertisement based on the profile of the user in response to the transaction handler processing a transaction of the user, and a portal coupled to the transaction handler to provide the advertisement for presentation to the user in connection with information about the transaction of the user. In one example, the profile includes a plurality of values representing aggregated spending of the user in various areas to summarize the transactions of the user.