HilltopAds Unveils Smart CPM for Popunder Campaigns, Advancing Automated Bidding in AdTech – the London‑based ad network announced a new automated bidding model on May 29, 2026 that promises to lower cost‑per‑thousand impressions (CPM) while giving advertisers granular budget controls.
What’s New
HilltopAds introduced Smart CPM, an algorithmic bidding engine built into its Popunder inventory. Unlike traditional fixed‑price CPM deals, Smart CPM evaluates live auction data and adjusts bids in real time, ensuring that advertisers only pay the minimum amount required to win an impression. The feature is now available across all Popunder campaigns in the HilltopAds platform and can be toggled directly in the campaign settings.
How Smart CPM Works
The system ingests bid‑request signals—such as floor price, user profile, and inventory scarcity—and runs a micro‑optimization loop every millisecond. When the market is competitive, the engine raises the bid just enough to secure the slot; in low‑demand moments, it pulls back, preserving the advertiser’s CPM ceiling. This dynamic approach mirrors the real‑time bidding (RTB) logic used by demand‑side platforms (DSPs) but is tailored to the popunder format, which historically suffered from opaque pricing.
Why It Matters
Automated bidding is no longer a niche feature. Gartner forecasts that by 2025, 70 % of global ad spend will be programmatic purchased, and IDC reports that advertisers who adopt real‑time bid optimization see up to 30 % higher return on ad spend (ROAS). Smart CPM aligns HilltopAds with that trajectory, offering marketers a tool to curb overspend while still reaching premium inventory. For enterprise teams juggling multiple campaigns and strict CPM caps, the ability to set a hard CPM limit without manual bid adjustments reduces operational overhead and minimizes the risk of budget overruns.
Competitive Context
Smart CPM enters a crowded field of automated bidding solutions. Google’s DV360 and Amazon Advertising already provide algorithmic CPM options for display and video, while Microsoft’s Audience Network offers similar capabilities for native formats. However, HilltopAds differentiates itself by focusing on the popunder niche, a format that remains under‑served by the major players. The company also bundles Smart CPM with its existing suite of targeting, post‑back tracking, and micro‑conversion analytics, creating a more cohesive workflow for advertisers who prefer a single‑vendor stack.
Implications for Enterprise Marketers
For large brands, the shift toward automated bidding models like Smart CPM translates into three practical benefits:
- Budget Predictability – Fixed CPM ceilings prevent surprise spend spikes, a common pain point in multi‑regional campaigns.
- Efficiency Gains – Real‑time bid adjustments eliminate the need for daily manual bid tweaks, freeing media planners to focus on strategy rather than tactics.
- Performance Transparency – Integrated reporting dashboards show cost per impression, win rates, and lift metrics side‑by‑side, enabling data‑driven optimization across the funnel.
Marketers that already leverage customer data platforms (CDPs) or data management platforms (DMPs) can feed first‑party signals into Smart CPM, sharpening audience segmentation and further improving bid relevance. As privacy regulations tighten, the ability to operate within a controlled CPM framework while respecting consent preferences becomes a competitive advantage.
Industry Outlook
The broader adtech ecosystem is moving toward greater automation, AI‑enabled bidding, and unified measurement. A Forrester study notes that AI‑enabled bidding can reduce cost per acquisition (CPA) by 15–25 % when combined with robust attribution models. HilltopAds’ Smart CPM is a step toward that integrated future, positioning the platform as a potential bridge between legacy popunder inventory and next‑gen programmatic ecosystems such as connected TV (CTV) and over‑the‑top (OTT) channels.
Market Landscape
Programmatic buying now dominates display, video, and emerging formats. While major DSPs dominate the high‑volume inventory, niche networks like HilltopAds retain relevance by offering specialized formats and bespoke optimization tools. The rise of privacy‑first advertising—exemplified by Google’s Privacy Sandbox and Apple’s ATT framework—has forced vendors to innovate on cost‑control mechanisms that do not rely on third‑party cookies. Smart CPM’s reliance on real‑time auction data rather than persistent identifiers aligns with this privacy‑centric shift.
Enterprises are also seeking unified measurement across channels. The convergence of adtech with marketing platforms such as Salesforce Marketing Cloud and Adobe Experience Cloud means that bidding solutions must expose APIs and data feeds that integrate with broader analytics pipelines. HilltopAds’ API‑first approach for Smart CPM suggests the platform is ready for such integration, though the company’s limited public documentation may hinder rapid adoption compared with more established players.
Top Insights
- Smart CPM gives advertisers real‑time bid flexibility, cutting average CPM by up to 20 % in volatile markets.
- Automated bidding is projected to power 70 % of ad spend by 2025, making tools like Smart CPM essential for budget predictability.
- Enterprise marketers can pair Smart CPM with first‑party data to improve audience relevance while staying compliant with privacy regulations.
- HilltopAds targets a niche—popunder ads—where competition is limited, offering a differentiated value proposition versus Google or Amazon.
- Integration readiness (APIs, reporting) will determine whether Smart CPM scales beyond small‑to‑mid‑size advertisers.
