What is SDK advertising?
SDK advertising is how mobile apps show ads: a software development kit (SDK) embedded in the app requests ads, runs the auction/mediation across demand sources, and renders the winning ad inside the app. It’s the in-app equivalent of the browser ad stack — but instead of JavaScript in a page, it’s native code compiled into the app.
Because apps don’t have a browser’s cookies or page context, in-app monetization relies on the SDK, device signals, and mediation to compete demand and maximize eCPM.
How app monetization works
- An ad SDK is integrated into the app (often a mediation SDK that sits above several ad networks).
- When an ad slot is reached, the SDK requests bids/ads from its connected demand sources.
- Mediation runs the competition — historically a ranked waterfall, increasingly in-app bidding where networks bid simultaneously (the app-side equivalent of header bidding).
- The winning ad renders in the app in the chosen format.
The shift from waterfall mediation to in-app bidding is the same story as web: simultaneous competition prices inventory better than a sequential chain.
The formats that drive app revenue
App monetization leans on higher-value formats more than web does:
- Rewarded video — opt-in, high CPM, high satisfaction. A staple of games and freemium apps.
- Interstitials — full-screen at natural breaks; high CPM but must be frequency-capped and placed at transitions.
- Banners — steady, lower-CPM baseline, useful for persistent placements.
- Native — native units that blend into app feeds and content.
What matters for app publishers
- Mediation quality. More networks competing (ideally via in-app bidding) means higher fill and eCPM.
- SDK weight and performance. Every SDK adds app size and can affect performance and stability — keep the stack disciplined.
- User experience and store policy. Google Play and the App Store have rules about ad behavior (no ads at launch, no interrupting active tasks); violating them risks removal.
- Privacy signals. App tracking is constrained (ATT on iOS, etc.), so contextual and first-party signals matter more.
App vs web monetization
The goals are the same — compete demand, optimize yield — but the mechanics differ: web runs in the browser via header bidding and Prebid; apps run through an SDK and mediation. Publishers with both surfaces need a stack that handles each properly rather than forcing one model onto the other.
The bottom line
SDK advertising is the engine of app monetization: an embedded SDK that requests ads and mediates demand, paired with high-value formats like rewarded video and interstitials. The upgrades that matter mirror the web — move from waterfall mediation to in-app bidding for real competition, keep the SDK stack lean for performance, and respect store policies and privacy limits. For publishers running apps, competing that demand well is exactly what app monetization mediation is built to do.