An effective design for a price alert feature in the Coinbase app should take several factors into account. First, users should be able to set alerts in a straightforward and intuitive manner. This could involve incorporating it into the app's main menu, adding an 'Add Alert' button for each cryptocurrency, and allowing users to customize alerts based on their chosen price levels or percentage changes. Once the conditions for a price alert are met, the app should send a push notification. It's crucial that this notification is easily recognizable as a Coinbase price alert. In addition to displaying the current price, the notification should include comparison figures and the percentage change for added context. To improve user experience, the notification should enable users to take immediate actions if desired, such as buying or selling the cryptocurrency, adjusting the alert, or pausing it. To address the possibility of excessive notifications, users should have the option to customize the frequency of alerts or activate a "Do Not Disturb" mode during specific hours.