European Unfair Commercial Practices Enforcement in Ad Telemetry Disputes
European unfair practice laws shift the burden of proof to ad platforms, enabling buyers to claw back spend using forensic log telemetry reconciliations.
Ad Stacking Detection
Meaning
Verification systems identify instances where multiple advertisements occupy a single slot to extract fraudulent fees. Effective ad stacking detection prevents payment for impressions that remain hidden behind a top layer. Advertisers use these tools to ensure that only the visible creative receives credit for the placement.
Verification Logic
Algorithmic checks examine the z-index of overlapping frames within a browser or application. When ad stacking detection identifies multiple layers, it flags the transaction as invalid. The process happens in real time during the bid request or immediately after the impression fires.
Contractual Obligation
Service level agreements usually define the thresholds for invalid traffic and the methods for recovery. By including ad stacking detection as a requirement, brands protect their media spend from being diluted by non-viewable inventory. Agencies often bear the responsibility for implementing these checks on behalf of the buyer.
Audit Result
Reconciliation occurs when logs from the verification vendor are compared against the billable counts of the ad server. Any discrepancy found through ad stacking detection leads to a credit or a deduction from the final invoice. This mechanism maintains the integrity of the supply chain by ensuring that the buyer only pays for media that had a physical opportunity to be seen.
If a publisher fails to meet the agreed viewability standards over a sustained period, the contract may allow for termination or the permanent removal of the site from the whitelist.