A new ChannelAdvisor report for August finds that same-store sales on eBay failed to keep pace with the overall e-commerce growth rate.

August was a good month for ChannelAdvisor Corp. clients that sell on Amazon.com Inc.’s marketplace, but not so hot for those selling on eBay Inc.’s shopping portal.

ChannelAdvisor produces monthly reports that compare its merchant clients’ sales through various online shopping portals and marketing channels, including Amazon.com, eBay Inc. and Google Shopping.

Amazon’s same-store sales, which ChannelAdvisor defines as merchants who have sold on the marketplace for at least a year, grew 45.1% in August. That follows 40.4% growth in July. Amazon, No. 1 in the Internet Retailer 2014 Top 500 Guide, has increased its growth rate each month this year.

Moreover, 35.4% of Amazon’s gross merchandise volume sold by ChannelAdvisor clients during the month was shipped through the retailer’s Fulfillment by Amazon program, a service that lets merchants store inventory at Amazon warehouses with Amazon handling delivery to the customer. That’s up from 31.5% in August 2013.

In addition, some ChannelAdvisor clients are letting Amazon deliver orders they take on their own web sites. The percentage of gross merchandise value sold by ChannelAdvisor clients shipped through the Fulfillment by Amazon program that was not sold through Amazon’s Marketplace was 1.9%, up from 1.4% a year earlier.

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Meanwhile, eBay’s same-store sales grew 5.9% in August. That’s down from 9.7% growth in July and well below the 15.7% second quarter e-commerce growth rate the U.S. Commerce Department reported last month. eBay’s fixed-price sales grew 6.9% in August compared to the same month in 2013. In July, eBay’s fixed-price sales grew 12.8% year over year. 

There are multiple reasons behind eBay’s slow sales, says Scot Wingo, ChannelAdvisor’s CEO. The online marketplace is still facing headwinds from the breach it reported in May, he says. Many of the online marketplace’s pages may also have been hurt by Google’s May update to its search algorithm, which aimed to reward high-quality web sites with better rankings in organic search results.

EBay did not immediately respond to a request for comment.

EBay also in August introduced the eBay Defect Rate, which penalizes sellers with high return rates in its seller performance rankings. That led many ChannelAdvisor clients that sell used goods to reduce the number of items they sell on the marketplace because shoppers return used goods at a higher rate than new items, Wingo adds.

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ChannelAdvisor also reported same-store sales for comparison shopping engines grew 21.1% in August, a jump from 9.5% growth in July. That was largely driven by Google Shopping’s 54.3% growth, up from 40.8% growth in July. While ChannelAdvisor’s clients saw their Google Shopping conversion rate dip from 2.6% in July to 2.29% in August, their average order value grew 24.5% from $94.99 to $118.26, which more than made up for the conversion rate dip, Wingo says.

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