Pixalate Releases Q1 2026 Mobile Seller Trust Index 2.0: 16.2% of Global Authorized Mobile App Inventory Is Resold Through Arbitrage; Google AdExchange Top-Ranked 'Direct' Seller in the US

Why It Matters

The findings expose hidden supply‑chain inefficiencies that can erode ad spend efficiency and increase fraud exposure, prompting advertisers to prioritize direct sellers and tighter verification.

Key Takeaways

• 16.2% of global mobile inventory resold, below web's 20.8%
• Google AdExchange tops US with <1% arbitrage, high SIVT
• Arbitrage rises sharply in India, Mexico, Australia (+11, +9, +8 pp)
• Pixalate ranks 200+ sellers in 100+ markets; index free
• Overall arbitrage rate down 0.6 pp QoQ, indicating improvement

Pulse Analysis

The Mobile Seller Trust Index 2.0 offers a granular view of the mobile programmatic supply chain, leveraging app‑ads.txt disclosures and Pixalate’s SupplyChain Object analysis to verify whether impressions travel through authorized‑direct paths. By quantifying both arbitrage risk and invalid‑traffic ratios—SIVT and GIVT—the index equips marketers with data‑driven insights to differentiate genuine publisher inventory from reseller‑driven traffic that often carries higher fraud exposure. This methodological rigor is especially valuable as mobile ad spend surpasses $200 billion annually, making supply‑chain transparency a competitive advantage.

Across the globe, the index shows that 16.2% of authorized mobile inventory is resold, a figure that sits between the web’s 20.8% and CTV’s 4.1%. The United States market is dominated by Google AdExchange, which maintains sub‑1% arbitrage while delivering a sizable direct publisher footprint. Meanwhile, regions such as India, Mexico and Australia experienced double‑digit jumps in arbitrage‑heavy SSPs, signaling localized market pressures that could inflate costs for advertisers lacking direct relationships. These geographic disparities underscore the need for region‑specific buying strategies and heightened vigilance around supply‑chain integrity.

For the broader ad ecosystem, the quarterly release of a free, publicly accessible index creates a benchmark that can drive industry‑wide improvements in inventory quality. Publishers can use the rankings to showcase their direct partnerships, while demand‑side platforms may adjust bidding algorithms to favor low‑arbitrage sellers. As ad fraud detection standards evolve, tools like Pixalate’s index will likely become integral to budgeting decisions, risk assessments, and the ongoing push toward a more transparent, efficient mobile advertising market.