Abstract: Various embodiments pertain to techniques for forecasting and providing guaranteed delivery of ad impression opportunities using real-time bidded platform inventories. In various embodiments, bid landscape data, such as information regarding a number of impression requests by a particular supply unit, a time of the impression requests, and an amount of a winning bid for the impression requests, is recorded for use in forecasting an available impression volume as a function of cost. The forecasted available impression volume represents a number of ad impression requests likely to be obtained through real-time bidding channels. In various embodiments, an advertiser can place an order for a number of ad impressions at a particular price, and the ad impressions ordered can be specifically allocated for that advertiser. The number of ad impressions ordered by an advertiser that are guaranteed vary depending on the price and the available volume forecasted at that price.