A determination is made regarding whether a user is allowed to access a content item. The content item is associated with a website. An offer associated with the website is identified. The offer includes a set of use-time rules specifying time periods during which the offer can be used to access content. A use-time rule is associated with a user class. A class of the user with respect to the offer is determined. The user's class indicates whether the user has accepted the offer or whether the user has registered with the website. A determination is made regarding whether the user is allowed to access the content item based on the offer, the user's class, and a current timestamp.