A bidder is a "decisioning brain" that calculates real-time auction bids using an algorithm and parameters such as user data, recency, location, etc. and plugs into one or more inventory sources using real-time bidding (RTB) APIs. Clients with existing bidders can plug in to our the Xandr (formerly AppNexus) real-time platform to expand their access to premium and unique sources of supply and engage in transparent and technologically advanced media buying.
The documentation you'll find here will help you navigate the AppNexus Xandr software in support of bidders. This includes information on using our API services, integrating bidders, and the OpenRTB protocol. You can browse through the help resources we've provided here to learn more.