Auto-detecting an action on a merchant service and rendering an offer button to display an offer redeemable based on the action. A user accesses a merchant service and an indication of the action is communicated to an offer system that maintains an account for the user. The offer system determines whether the user has an offer applicable to a purchase with the merchant. The user device presents an offer button rendered to indicate that the first offer is available for redemption by the user. The user initiates an action on the merchant service and the user device communicates an indication of the action to the offer system. The offer system determines if the user has a second offer applicable to a purchase with the merchant based on the action taken by the user and the offer button is rendered to indicate that the second offer is available for redemption.