Which API feature exposes granular data around where in the pipeline bidders are missing the chance to win an ad impression?

The RTB Breakout API provides detailed information about why bids are not winning impressions, offering insights into various stages of the real-time bidding pipeline. This includes reasons like bid rejections, filtering, or losing to higher bids, allowing bidders to diagnose and optimize their strategies. The Pre-targeting API helps define which impressions to bid on, not why bids are failing. The Marketplace API facilitates deal negotiation and management, while the Creatives API manages ad creative submissions and approvals.