Fill Rate

What is Fill Rate

Fill rate is a key performance metric in mobile advertising that measures the percentage of ad requests successfully filled with an ad impression. Each time an app sends a request to an ad network or demand source, it expects an ad to be delivered. The fill rate shows how often these requests result in an actual ad being shown, reflecting how effectively available inventory is being used.

Why Fill Rate matters

Fill rate is a critical metric for both publishers and advertisers:

• Maximizing revenue: high fill rates ensure that available inventory is monetized effectively, generating consistent ad revenue.

• Optimizing partnerships: by monitoring which demand sources reliably deliver ads, publishers can prioritize or renegotiate relationships with high-performing partners.

• Improving user experience: consistent ad delivery reduces blank ad spaces and ensures smoother in-app experiences for users.

• Campaign efficiency: advertisers can better understand how well their campaigns reach the intended audience and allocate budget accordingly.

Fill Rate in the context of MMPs

Within the framework of Mobile Measurement Partners (MMPs), fill rate becomes an essential tool for evaluating the performance of ad networks and demand sources. By monitoring how often ad requests are successfully filled, publishers can:

• Identify consistently high-performing partners and allocate more inventory to them

• Detect underperforming networks that may require optimization or replacement

• Ensure consistent ad delivery to enhance both revenue and user experience

For advertisers, fill rate insights provide clarity into the quality and reliability of traffic. Understanding how frequently ad requests are filled enables better decision-making regarding campaign scale, bid strategy, and targeting effectiveness.