The MAX In-App Bidding Exchange is a first-price, fair and transparent, unified first-price auction in which the highest bidder wins. All SDK in-app bidders and DSPs have equal access to each ad impression opportunity. They receive full notification coverage with enhanced macros.
The MAX In-App Bidding Exchange collects bids for individual impression opportunities from SDK-based demand partners and DSPs. It does this via the OpenRTB 2.5 protocol. To integrate with MAX, a bidder must comply with the OpenRTB 2.5 API.
To read the MAX in-app bidding spec for SDK-based in-app bidders, see the AppLovin oRTB specification page

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MAX auction server merges these with the non-bidding demand sources in the publisher waterfall.