How E-Commerce Is Transforming Retail Media Advertising

The digital retail landscape is undergoing a seismic transformation. As consumers shift their shopping habits online, a powerful advertising model has emerged: retail media networks (RMNs). These platforms enable brands to purchase ad space directly on retailers’ digital properties, leveraging first-party data to deliver targeted advertisements to consumers at the point of purchase. The global retail media networks market was valued at $22.4 billion in 2024 and is projected to exceed $34 billion by 2029. This growth is driven by e-commerce expansion, third-party cookie deprecation, and retailers recognizing advertising as a high-margin revenue stream.

E-commerce has grown from less than 5% of retail sales in 2010 to over 21% by 2025. More than 70% of buying journeys now begin on retail websites rather than search engines. When shoppers visit e-commerce platforms, they demonstrate clear purchase intent—making retail media advertising extraordinarily effective. Mobile commerce has accelerated this shift, with smartphone users growing from 2.79 billion in 2018 to over 4 billion today, creating an ever-expanding canvas for retail media.

Advertisers are increasingly focusing on ROAS (Return on Ad Spend) that measures revenue generated per advertising dollar. This metric gets compared between ad networks. Because retailers control both advertising and point of sale, they provide closed-loop attribution—directly connecting ad impressions to purchases.

Leading brands achieve 3x to 5x ROAS with properly optimized campaigns. In this setting, RMIQ is a brand new platform addressing fragmentation by connecting brands to 60+ retail media networks—including Amazon, Walmart Connect, and Instacart—through a unified, AI-powered interface. For agencies and brands alike, such platforms provide the scalability needed to succeed across the retail media ecosystem.

The Key Players

Amazon Advertising Amazon’s advertising business reached $56.2 billion in 2024—twice the size of the global music industry and exceeding YouTube’s ad revenue by $20 billion. Working with an Amazon advertising agency has become essential for brands on the world’s largest e-commerce platform. Amazon offers Sponsored Products, Sponsored Brands, Sponsored Display, and Amazon DSP. Its closed-loop measurement allows advertisers to track the direct relationship between ad spend and sales with unparalleled clarity.

Walmart Connect Walmart Connect reached $4.4 billion in 2024, growing 27% year-over-year—the fastest among major retail media networks. For brands seeking a Walmart advertising agency, the opportunity is substantial. Walmart’s unique strength is combining America’s largest physical retail footprint with growing digital capabilities.

This omnichannel approach lets advertisers influence both online and in-store purchases. Partnerships with The Trade Desk, Roku, TikTok, and Snap extend reach across connected TV, social media, and programmatic channels.

Instacart Advertising Instacart dominates grocery delivery advertising with $33 billion in gross transaction value and coverage of 85% of U.S. households. An Instacart advertising agency helps CPG brands navigate this specialized platform effectively. Instacart’s advertising generated over $1.18 billion in 2024 through Featured Product ads, display ads, and sophisticated targeting based on purchase history. Its Roku partnership enables connected TV advertising, extending brand reach beyond the point of purchase.

The Fragmentation Challenge Over 80% of top U.S. retailers operate their own retail media networks, each with distinct products, bidding mechanisms, and reporting formats. This fragmentation creates data silos, inconsistent metrics, and operational complexity.

AI-powered aggregation platforms have emerged to address this challenge. These solutions unify campaign management across networks, delivering centralized reporting and automated optimization. Brands report 3x higher ROAS, 50% reduction in wasted spend, and 100x faster insights through AI-driven management.

In-store retail media is the next frontier, projected to grow at 11.9% CAGR. Off-site advertising is expanding rapidly, with 20%+ of U.S. retail media spend going to third-party channels in 2025. Cookie deprecation continues accelerating advertiser migration to first-party retail data.

AI-Powered Optimization

The Next Frontier Artificial intelligence is rapidly transforming how brands manage their retail media investments. The sheer volume of data generated by retail media campaigns—billions of data points across products, keywords, placements, and audiences—exceeds human capacity for analysis and optimization.

AI-powered platforms can process this data in real-time, identifying patterns and optimization opportunities that would be impossible for human analysts to detect. Modern AI-driven retail media platforms employ multi-agent architectures where specialized AI agents handle different aspects of campaign management. Network optimizer agents continuously adjust spend allocation based on real-time performance data.

Bidding agents analyze auction dynamics and adjust bids to maximize efficiency. Budget allocation agents dynamically redistribute spend across campaigns and platforms to achieve optimal returns. A/B testing agents orchestrate experiments to continuously improve campaign performance. The results of AI-powered optimization can be dramatic.

Brands implementing AI-driven campaign management report 3x higher ROAS, 50% reduction in wasted ad spend, and insights delivered 100 times faster than manual analysis. Perhaps most importantly, AI enables brands to scale their retail media operations without proportionally scaling their teams, making sophisticated advertising strategies accessible to businesses of all sizes.