The End of Rented Identity — Nikhil Raj, MetaRouter

Retail media has a timing problem. Most systems are still built around audience targeting after the fact, instead of capturing data at the “first mile” when the interaction actually happens. By the time you’ve identified the shopper, matched them, and activated, it’s already too late. In this episode of The Middlemen, we talk with Nikhil Raj of MetaRouter about how that model is changing. Nikhil was part of the team that built Walmart Labs after the Kosmix acquisition, where they had to solve identity and measurement without a loyalty program. That constraint led to a different approach to data, identity, and advertising infrastructure that is now showing up again across retailers. We get into: • How Walmart built its advertising and data foundation • What “first mile” data infrastructure means — capturing data at the point of interaction, not after it’s been processed and moved around • Why most audience targeting pipelines are too slow • How real-time behavioral signals change how retail media works • What it means to move from renting identity to owning it • How this connects to offsite channels like Google Product Listing Ads • The role of AI and real-time inference in audience building • What agentic commerce and new discovery channels might change • Why bot traffic and wasted spend are becoming a bigger issue This is a conversation about how retail media shifts when timing and infrastructure change. ⸻ Chapters: 00:05 Introduction 04:09 Nikhil’s Background and Walmart Labs Origin 07:54 Building Walmart’s Advertising Infrastructure 15:34 The First Mile and Modern Data Infrastructure 19:51 Real-Time Identity and Audience Building 25:35 Technical Implementation and Integration 29:26 The Future of AI and Commerce 32:14 Agentic Commerce and New Channels 39:51 Bot Detection and ROAS Optimization ⸻ About Nikhil Raj: Nikhil Raj was part of the team that built Walmart Labs and helped establish early retail media infrastructure. He is now at MetaRouter, focused on real-time data, identity, and activation systems for retailers. Subscribe to the Middlemen Podcast and our Substack - Shopper Missions! https://middlemen.substack.com/