Header Bidding Q&A: Industry Expert Interview Series [Part 1]
Header bidding has matured into one of the primary mechanisms publishers use to sell ad inventory — but the landscape keeps shifting, with new challenges and opportunities emerging year over year.
Below, three practitioners working across different parts of the ecosystem share their perspectives on where header bidding stands today.
Interviewees:
Filip Sadowski — AdTech Expert at Yieldbird
Daniel Elad — Chief Strategy Officer at TheViewPoint
An industry system architect with extensive experience in programmatic infrastructure
When Does It Make Sense for a Publisher to Implement Header Bidding?
In my opinion, the answer is quite simple: always.
The days when header bidding meaningfully dragged down a website's performance are largely behind us. There is still some impact, but with proper implementation and configuration it's negligible.
In practice, the revenue increase publishers see from header bidding typically lands around 20–30%, and in specific markets and setups can reach as high as 50%.
When header bidding first arrived, the implementation process was genuinely difficult — resources were scarce and contracts with SSPs were hard to come by. Today, platforms like Yieldbird help publishers get up and running by offering their own Prebid.js-based wrappers, tooling, and analytics. Publishers can even access multiple SSPs through a single relationship, without needing individual contracts with each one.
Given today's ease of implementation, the variety of efficient setup options, and the accessibility of SSPs, there's little reason for a publisher to wait.
Filip Sadowski, AdTech Expert at Yieldbird
What Percentage of Publishers Are Using Prebid.js vs. Prebid Server — and Are Any Using Both?
Exact figures are hard to pin down, but having worked with many publishers over the years, very few are running Prebid Server exclusively.
The main blockers are cost and complexity. Prebid Server is significantly more complicated than Prebid.js, and the knowledge required to implement it properly isn't easy to acquire.
Among publishers that do use Prebid Server, the near-universal pattern is a hybrid approach — Prebid.js handling the client side alongside Prebid Server on the server side. The most common configuration places the top-performing SSPs (strongest revenue contributors) on the client side, with the remaining SSPs handled server-side.
Filip Sadowski, AdTech Expert at Yieldbird
How Should Teams Manage Their Prebid Setups and Measure Header Bidding Performance?
Managing both a client-side Prebid.js implementation and a server-side Prebid Server deployment is genuinely complex, particularly for developers and AdOps teams without deep header bidding experience.
Most teams manage their Prebid setups by making manual changes directly in code. That approach is error-prone — misconfigurations can cause the header bidding process to degrade or fail entirely, often in ways that aren't immediately obvious.
The more reliable path is managing the Prebid setup through a dedicated user interface. This lets both developers and AdOps teams adjust configuration without touching code directly, reducing the risk of mistakes and significantly speeding up the change cycle.
UI-driven management tools for Prebid have emerged in this space precisely to address these operational pain points — giving teams visibility into auction performance alongside a safer mechanism for making configuration changes.
— Industry system architect
What Are the Main Challenges Around Header Bidding?
Header bidding demands a more complex integration than standard VAST tag implementation, along with higher operational costs and fees — but it performs meaningfully better for bidding.
The challenge is that those incremental costs aren't always justified at smaller scale. In many markets, a large proportion of SSPs are sending bid requests to the same underlying DSPs, which means stacking additional integrations yields diminishing returns without a corresponding revenue uplift.
Daniel Elad, Chief Strategy Officer at TheViewPoint
What Challenges Exist When Applying Header Bidding to In-App Mobile and CTV?
In the CTV space, brand safety concerns and complex business rules from major publishers make working with a wide range of exchanges impractical. A large share of programmatic CTV activity runs through curated marketplaces rather than open auctions — and those curated environments offer clearer priority signals for buyers and sellers alike.
The net effect is that far fewer SSPs and DSPs are actively involved in the bidding process for CTV inventory, which reduces the incremental value header bidding would add over existing direct or curated arrangements.
Daniel Elad, Chief Strategy Officer at TheViewPoint