Methods and systems can provide custom electronic-channel content items to display when a device is in display state. It can be determined that a user device is subscribed to receive content items corresponding to a channel and to present one or more of the content items when the user device is in a display state. Data corresponding to the user device can be identified. The data can correspond to a physical or electronic action (e.g., an interaction with a presented content item or a purchase at a channel-associated virtual or physical store). A customization rule for the channel can be identified. A content item can be generated or selected using the customization rule and the data. It can be enabled for the content item to be presented on the user device when the user device is in the display state.