If you’re an eBay seller, you already know how fierce the competition can be. But what if you could peek behind the curtain and see exactly which products are working best for your competitors? What if you could find their best-selling eBay products, see what’s trending, and even how fast those items are selling? With WatchCount.com, you can.
This guide will show you how to use WatchCount to uncover the best-selling products on eBay and turn that insight into stronger listings, smarter sourcing decisions, and more sales for you!
Step 1: Who’s Your Biggest Competitor?
Start by heading to WatchCount.com. In the “Search by Seller” field, enter your competitor’s eBay ID. Then pick a relevant Category from the dropdown to narrow your results to the relevant vertical. Click “Show Me!” and let WatchCount go to work.
Your results will be sorted by Watch Count, showing your competitor’s most-watched listings first. These are very likely to be their best-selling eBay products.
Here’s what that search setup looks like:

Step 2: Analyze Your Competitor’s Best-Selling eBay Products
Look at your competitor’s most popular items. They are sorted by watch count, so the “most watched” items appears first.
Here’s an example of the results you might see:

WatchCount.com reveals a wealth of insights about your competitor’s most popular, best-selling products:
- Number of Units Sold: The total number of units sold since the item was originally listed.
- Average Sales Velocity: The number of units sold per period. Average Sales Velocity allows you to meaningfully compare the number of units sold for items with vastly different start dates. A listing that’s sold 1,000 units in one month is much more desirable than one that’s sold 1,000 in one year.
- Item Price: The current price of the item. You can multiple the price by the number of units sold to estimate the total sales for that item. A $30 product that’s sold 400 units generated about $12,000 in sales.
- Purchase History: The dates, quantities, and prices at which the item was sold recently. This helps verify that the product is still actively selling.
- Number of Watchers: The number of eBay users who are “watching” this item. Items with a high watcher counts have a lot of interest and tend to be strong sellers.
- Feedback: Read buyer feedback for that item. Lots of positive feedback indicates that product is satisfying its buyers. However, a best-selling item with many negative reviews may have quality issues and should generally be avoided.
- Start Date: The original listing date of the item. Was this item listed recently, or has it been a core offering for a long time?
Combined, these metrics give you a powerful view into your competitor’s best-performing inventory.
Step 3: Increase Your Sales by Stealing Their Best Ideas
Now that you’ve uncovered their best-selling products on eBay, it’s time to use that insight:
- Source Similar or Better Products: Use their proven listings as a roadmap. You don’t need to guess what buyers want – now you have accurate, real-time sales data to guide your product sourcing.
- Improve Your Existing Listings: Optimize underperforming items in your own store using the lessons you learned from your competitors. Provide sharper images, improve title keywords, offer free or reduced shipping, or make pricing more competitive to steal market share.
- Find Product Opportunities: Is there a related product they’re not offering that you could bring to market? A different variation, size, or kit that fills a buyer need?
Competitive research is powerful. Leverage what you’ve learned from your competitor’s best-selling items to enhance your own listings and select new products to offer.
Why WatchCount is Your Secret Weapon for eBay Competitive Research
Sellers don’t openly share their winning strategies. Using live data provided directly from eBay, WatchCount analyzes your competitors’ listing and identifies their best-selling products.
With WatchCount, you can:
- Discover the best-selling eBay products in your niche
- Track your competitor’s top-performing listings
- See what’s just beginning to trend
- Avoid low-performing or over-saturated products
And best of all – you can do it for free, in seconds, with no login.
Ready to uncover your competitors’ best-selling eBay products? Head over to WatchCount.com and search by seller right now.

