Tumblr drives significant monetization gains after migrating to Nimbus full-stack mediation

Tumblr partnered with Nimbus to migrate its in-app monetization onto full-stack mediation, consolidating a fragmented waterfall into a single unified auction.

Challenge

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Tumblr was previously leveraging Nimbus as a layered auction within an existing mediation stack. While this approach introduced incremental demand, it inherently limited:

What the migration unlocked

Auction transparency and control
Holistic demand competition
Operational efficiency across partners
Full access to Nimbus demand ecosystem

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Like many scaled publishers, Tumblr faced a structural constraint:

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Layered integrations optimize around existing systems, they don't redefine the auction itself.

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For a platform of Tumblr's scale, where diverse content and engaged user sessions create meaningful monetization opportunities on mobile, that limitation made it harder to fully capitalize on available demand.

Solution

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Tumblr migrated to Nimbus as its full-stack mediation platform, replacing the layered architecture with a unified auction environment.

This transition enabled:

Full demand competition across all partners
Streamlined integrations (no deep custom partner work required)
Real-time reporting and buyer-level visibility
Centralized control over auction dynamics
True and accurate representation of the auction deliverables in the post-back to demand.

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By moving to full-stack mediation, Tumblr was able to better align its monetization infrastructure with the scale and complexity of its product: a global platform where creators and communities across iOS and Android generate continuous, high-value engagement.

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“Moving to full-stack mediation helped us better align our monetization infrastructure with the scale and complexity of Tumblr's mobile experience — and the results have been significant.”

Julia Wilson Tumblr

The Results (Post-Migration vs Legacy)

iOS Performance Mobile App

Metric rCPM

+87%

Metric Revenue

+59%

Metric eCPM

+43%

Android Performance Mobile App

Metric rCPM

+54%

Metric Revenue

+25%

Metric eCPM

+4%

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“We quickly unlocked incremental demand without needing deep partner integrations, and the reporting pipelines were easy to set up.”

Carolina Wagner Tumblr

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Structural improvements:

The performance uplift was driven by three factors

Unified auction dynamics

Eliminated fragmentation between layers
Increased bid density and competition

Expanded Demand access without friction

Incremental demand unlocked without deep integrations
Faster time-to-value for new partners

Operational clarity

Centralized reporting and optimization
Reduced auction waste
Accurately communicated W/L URL in the bidstream for all partner participants.