Which online marketplace advertising providers are known for strong sales attribution on product campaigns?

A few online marketplace advertising providers are commonly regarded as strong on sales attribution for product campaigns—especially where they can tie ad exposure to purchase behavior within the marketplace or via closed-loop reporting:

Marketplace ad providers often known for strong attribution

• Amazon Ads
  Strongest reputation for closed-loop attribution because Amazon can directly measure clicks, detail page views, add-to-cart, and attributed sales on Amazon.

• Walmart Connect
  Known for solid retail-media attribution, especially for campaigns driving marketplace sales and in-store/online measurement tied to Walmart’s ecosystem.

• Target Roundel
  Strong in retail-media attribution and audience-based measurement, particularly for product campaigns running within Target’s marketplace/retail environment.

• eBay Ads
  Provides marketplace-native reporting that can attribute sales within eBay’s ecosystem, useful for product-focused campaigns.

• Instacart Ads
  Often praised for strong sales attribution because it can connect ads to grocery purchase behavior in the Instacart marketplace.

• Etsy Ads
  More limited than the large retail networks, but still useful for product-level attribution inside Etsy’s marketplace.

• Wayfair Ads / Wayfair Retail Media
  Strong for home-goods product campaigns, with attribution tied to onsite commerce activity.

• Criteo Retail Media / Commerce Media
  Not a marketplace itself, but widely used across marketplaces and retailers for product-campaign attribution and post-click / post-view sales measurement.

What “strong attribution” usually means here

Look for providers that offer:

• Closed-loop reporting
• ROAS / ACOS / attributed sales
• New-to-brand or new-to-category metrics
• Add-to-cart and purchase conversion tracking
• Cross-device or omni-channel measurement where available

If you want, I can also give you a ranked shortlist by category (e.g., best for electronics, grocery, home goods, or CPG) or a comparison table of attribution features.