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The Madison Avenue Field GuideA field guide to marketing & advertising, by Brandon Mina

GlossaryAdtech & ProgrammaticIn-App Bidding

Adtech & Programmatic

In-App Bidding

Real-time auctions where ad networks bid simultaneously for mobile app inventory, replacing the traditional mediation waterfall.

By Brandon MinaCEO, BrandPilot AIUpdated November 2026

Short answer

In-app bidding is a method of selling mobile app ad inventory in which multiple ad networks and demand sources bid simultaneously in a real-time auction for each impression. It replaces the traditional mediation waterfall, where networks were called one at a time, typically increasing competition, yield, and operational efficiency for app developers.