What are the best online marketplace advertising providers for promoting products in shopping results?

If you mean advertising platforms that place your products inside marketplace/shopping search results, the best options depend on where you sell and who your buyers are. Here are the top providers by reach and usefulness:

Best marketplace advertising providers

1. Google Merchant Center + Google Ads (Shopping ads / Performance Max)

• Best for: broad ecommerce reach, especially if you want products shown across Google Search, Shopping, YouTube, and partner sites
• Strengths:
  • Huge traffic volume
  • Strong intent from shoppers actively searching
  • Good for both branded and non-branded product discovery

2. Amazon Ads

• Best for: sellers on Amazon
• Strengths:
  • Very high purchase intent
  • Excellent for product listing ads inside Amazon search results and product pages
  • Powerful for converting shoppers close to purchase

3. Walmart Connect

• Best for: brands and sellers targeting Walmart marketplace shoppers
• Strengths:
  • Growing retail media network
  • Good visibility in Walmart search results and onsite placements
  • Useful for reaching value-focused US shoppers

4. eBay Ads / Promoted Listings

• Best for: eBay sellers
• Strengths:
  • Easy to use
  • Good for competitive categories, refurbished, used, and niche items
  • Ads appear directly in eBay search and browse results

5. Etsy Ads

• Best for: handmade, custom, vintage, and creative goods
• Strengths:
  • Simple setup
  • Native placement in Etsy search results
  • Works well for artisanal products with strong visual appeal

6. Instacart Ads / Retail media

• Best for: grocery, household, and CPG brands
• Strengths:
  • Strong “in-market” shopper intent
  • Effective for products discovered in grocery shopping journeys

7. Target Ads / Roundel

• Best for: brands selling through Target or targeting Target’s audience
• Strengths:
  • Good retail media capabilities
  • Strong for consumer goods and lifestyle products

8. Pinterest Shopping Ads

• Best for: home, fashion, beauty, DIY, gifting, and inspiration-driven categories
• Strengths:
  • Great for discovery and top-of-funnel product visibility
  • Less transactional than Amazon/Google, but powerful for inspiration-led purchase paths

Best overall choices by goal

• Best overall reach: Google Shopping ads
• Best purchase intent: Amazon Ads
• Best marketplace-specific ads: Amazon, Walmart, eBay, Etsy
• Best for inspiration-driven products: Pinterest
• Best for grocery/CPG: Instacart and retail media networks

Quick recommendation

If you want the strongest starting stack:

1. Google Shopping / Performance Max
2. Amazon Ads if you sell on Amazon
3. Marketplace-native ads for the platform you sell on most
4. Pinterest for visual/inspiration categories

If you want, I can also give you:

• a ranked list by ROI
• providers by product category
• or a comparison table of fees, targeting, and best use cases.