The week in retail media: Walmart Connect takes purchase data off-site to Spotify and CTV

Walmart's media arm spent this week doing something its own walls were built to prevent: proving sales on channels it doesn't own.

What did Walmart Connect announce?

At its annual partner conference, Walmart Connect said it will let advertisers use its first-party audiences for addressable targeting on live linear TV for the first time, and expand CTV measurement through a Warner Bros. deal. The pitch, per MediaPost's coverage, is to reach the same Walmart shoppers across more channels and tie that exposure back to Walmart sales.

This follows a pattern. Portada's reporting notes Walmart is taking purchase data to Spotify and TV, after bringing its first-party audiences to Google's Display & Video 360 earlier in the year. The Vizio acquisition in 2024 was the hardware bet behind the same idea.

The business case is working. Walmart Connect grew 43% leaning on 280 million weekly shoppers' first-party purchase data, according to Yahoo Finance's comparison with Amazon Ads.

Why does off-site measurement matter now?

Retail media networks built their value on a closed loop inside their own properties. The ad ran on walmart.com, the purchase was recorded on walmart.com, and attribution stayed clean. The moment the ad runs on Spotify or a Warner Bros. stream, that loop has to stretch across a boundary the retailer doesn't control.

Off-site retail media measurement is the discipline of connecting ad exposure on one platform to a purchase recorded on another. Walmart is now selling this as a product: use our purchase data to target and measure on channels we don't own.

That is the same measurement problem a DTC brand already lives with, viewed from the retailer's side of the table. When Walmart proves a Spotify impression drove a store purchase, it is solving the exact gap you face when a Meta click drives an Amazon checkout.

What this signals for DTC brands

The retailers are telling you where attribution is headed, and they are funding it with their own balance sheets. First-party purchase data is the asset. Whoever holds it sets the terms of measurement.

For a brand selling through marketplaces, that creates a lopsided situation worth naming:

1. The retailer sees every purchase and builds an off-site measurement business on it.
2. You pay for the ad traffic, often on Meta, and see the click but not the sale.
3. Meta's delivery learns from whatever conversions it receives, so retailer-bound campaigns teach it to find clickers.
4. The revenue that proves your ad worked sits in a report you don't get.

Fragmented retail media data makes this worse. CXToday's analysis points out that more retail media networks means more disconnected reporting, each walled off from the next. A brand selling on Amazon, Walmart, and Target reconciles three measurement systems that never agree.

How a brand closes its own loop

You can't acquire Vizio. You can run the same closed loop on your side of the ad click. The mechanism is not complicated: capture the buyer-intent signal when a shopper leaves for the retailer, then feed it back to the platform that paid for the click.

Meta rebuilds delivery around buyer-intent signals rather than raw clicks once it receives them. Send the signal server-side through the Conversions API and it survives iOS privacy settings and ad blockers. This is the DTC equivalent of what Walmart just built for itself across Spotify and CTV.

The difference between measuring a click and measuring intent is the whole game. UTM tags confirm a click happened and stop there. The closed-loop pattern ties that click to a retail checkout and hands the connection back to Meta.

Who measures what, and where

Here is how the three off-site approaches compare for a brand whose sale lands at a retailer.

Walmart Connect off-site measurement is good for Walmart. Retailer attribution reports are siloed by design, which is why reconciling them across marketplaces is painful (ask anyone who has tried to line up three dashboards at quarter close). The brand closed loop is the only column where the signal belongs to you and reaches Meta, which is where your budget decisions get made.

The retailers moving off-site is the clearest signal yet that purchase data, not clicks, is the currency. The brands that own their own version of that data decide their own campaigns.

Where to start

• Website: www.pixamp.io. Send Meta traffic to retailers and get the buyer-intent signals back. First 1,000 clicks free, no card required.
• How it works: www.pixamp.io/#how-it-works. Connect Meta Business Manager, add a retailer button, launch. Live in under an hour.
• Book a demo: www.pixamp.io/#contact. A 20-minute walkthrough on a real retailer page, with the founding team.

Walmart is building off-site measurement to serve Walmart. The same loop, built on your side of the click, serves you.