There is a website called crazylister.com that offers very good information on whats been sold on eBay.

If you look at the table above you will see an example of what has been sold.

The product on the top line is a screen protector for an iPhone and we can see that over 64k units have been sold with the selling price plus the word count for the product description.

Now this is useful if you are in a mobile phone accessories niche as you can research this further and promote it with a review, rather than spending your time searching for keywords that might sell you now have something to focus on.

The seller centre on Ebay can give you great insights on whats trending on Ebay as well.

If you click on the advance search you can key in specific searches to see what is the most popular item in that niche.

This is useful if you are also an Ebay Affiliate. I have done training on how to use the Ebay Partner program:

https://my.wealthyaffiliate.com/training/create-links-while-...

its very straight forward and easy to operate and is complimented very well when you find something that is popular.