Are there any attribution platforms that handle closed-loop measurement across retail media channels?

Yes. Several attribution and measurement platforms support closed-loop measurement across retail media channels, meaning they can connect ad exposure to downstream sales outcomes using retailer or commerce data.

Common examples include:

• Nielsen Attribution / NielsenIQ – media-to-sales measurement across retail environments
• Neustar / TransUnion – multi-touch attribution and offline/online outcome linkage
• LiveRamp – identity/data connectivity that supports closed-loop retail media measurement
• Merkle – analytics and attribution services for retail media
• MediaLink / partnering measurement stacks – often customized for retail media ecosystems
• Amazon Marketing Cloud (AMC) – especially for Amazon Ads closed-loop analysis
• Walmart Connect measurement tools – for Walmart retail media performance
• Criteo Retail Media measurement offerings
• CitrusAd / Epsilon-style retail media measurement integrations
• Power Digital / Analytic Partners – depending on implementation, can support retail media incrementality and attribution

A few important caveats:

1. “Closed-loop” usually depends on retailer data access.
   The platform may not independently “know” sales unless it’s integrated with a retailer’s transaction or conversion data.

2. Coverage varies by channel.
   Some solutions work best within a single retail media network; others can aggregate across multiple retailers.

3. Attribution vs. incrementality vs. MMM.
   Many vendors call themselves attribution platforms, but the strongest retail media measurement stacks often combine:

   • attribution
   • incrementality testing
   • media mix modeling
   • clean room analysis

4. Retail media fragmentation is still a challenge.
   Cross-retailer closed-loop measurement is possible, but usually requires custom integrations or clean-room partnerships.

If you want, I can also give you:

• a shortlist by use case (Amazon-only, multi-retailer, enterprise, SMB),
• a comparison table, or
• a list of vendors specifically strong in incrementality + attribution for retail media.