eBay Algorithm Guide: Factors That Influence Rankings

The huge online marketplace eBay uses a proprietary algorithm, Cassini, to rank and promote product listings. This helps potential buyers find what they’re looking for while filtering out goods that don’t meet their search criteria. As a seller, managing your shop’s interactions with the eBay algorithm can improve your visibility on the platform. 

Although it started as an auction site for used goods, eBay became an online venue for all sorts of products, including new and luxury items. The eBay marketplace has more than 135 million active customers worldwide, and selling on eBay can play a key role in an ecommerce strategy.

Learn more about the eBay algorithm and how to use it for selling, along with details on how you can boost sales on eBay through Shopify.

What is the eBay algorithm?

The eBay algorithm is the formula eBay uses to sort and give visibility to its product listings. Named Cassini, this algorithm uses rules and instructions to decide how best to list and provide relevant search results to buyers. 

When sellers upload product listings, Cassini provides searchers with a Best Match ranking of those listings in search results. These results are based on their search terms and past purchases, as well as items’ prices and popularity, sellers’ track records, the quality and completeness of listings, and listings’ search terms, including return policies and shipping and handling times. 

Key factors that influence the eBay algorithm 

• Listing relevance of titles, keywords, categories, and photos
• Sales performance and conversion rate
• Pricing competitiveness and shipping options
• Seller performance based on ratings, feedback, and reliability

Popularity alone doesn’t determine rankings in eBay’s search results. Below are some of the factors that influence how eBay’s search algorithm ranks items:

Listing relevance of titles, keywords, categories, and photos

Listing relevance is determined by how closely the buyer’s search keywords match the details of the product listing. 

Similar to typical search engine optimization (SEO), the eBay algorithm considers the titles of items, relevant keywords used in the listing description, and category and subcategory selections—such as item location, condition, and color.

To optimize listings, sellers can work backward from the buyer perspective and consider what keywords their target audience will use. eBay’s guidelines include tips for listing optimization. For example:

• Use accurate descriptions and trending keywords that align with your items. 

• Use keyword research tools to find target phrases for listings.

• Ensure listings are honest and accurate, and avoid keyword stuffing, which may harm conversion rates if your products fail to match search intent. 

Accurate titles, text, and keywords help the eBay algorithm understand the listing and present it to the appropriate shoppers. 

In addition to relevant titles and thorough descriptions, the eBay algorithm also prioritizes listings with high-quality photos. Include clear, well-lit, high-resolution images that show the product from all angles.

Sales performance and conversion rate

The eBay algorithm considers conversion rates and sell-through rates. 

Conversion rate refers to the number of sales you make relative to the number of shoppers who view a product listing. A high conversion rate tells eBay that your listings tend to be accurate and meet buyer intent. Items from sellers with higher conversion rates appear higher in search rankings as the algorithm predicts which seller is more likely to make a sale.

Your sell-through rate refers to the number of sales you make in a given period (say, a month) compared to the number of active listings in that period. Though a catalog may list many items, eBay prefers newer, up-to-date listings that result in more sales. For example, if you have 50 active listings this month and sell 25 of them, your sell-through rate is 50%.

The eBay algorithm wants to see that you can sell consistently. Offering discounts and promotions on stock that isn’t selling can improve low sell-through rates. Sellers can also make use of eBay’s Best Offer feature, where buyers can bid on goods in an effort to negotiate a lower price.

Pricing competitiveness and shipping options

eBay hosts millions of sellers, many of whom offer the same or similar items, often with similar pricing. According to eBay, the algorithm prioritizes goods that are priced competitively. This means they’re priced around the average trending value for that product or a little lower. 

Note that Cassini considers the total cost to the consumer, meaning the listed price combined with shipping and handling charges, as well as shipping speed. Consider offering free shipping to capture shoppers’ attention. Flexible return policies can also contribute to search engine performance within eBay.

Seller performance based on ratings, feedback, and reliability

Your reputation as a seller affects listing rank in the algorithm. eBay typically recommends well-performing sellers with a record of accurately listing, managing, and completing a sale. Seller rating metrics include past sales volume, buyer feedback, shipping times, and sales completion rate versus sales cancellation rates. Positive feedback from customers doubles as social proof. 

The algorithm also assesses customer service and shopper interactions. Logging in frequently, monitoring your storefront, and keeping listings active show the algorithm that you are an active seller. Timely responses to buyer queries, prompt shipping, and shopper-friendly return policies can help boost rankings. 

How to manage eBay listings with Shopify

Shopify merchants can benefit from an omnichannel strategy that includes eBay as a way to diversify sales channels.

Shopify store owners can manage eBay listings through Marketplace Connect. The Marketplace Connect app lets businesses connect their Shopify store to their eBay store, list products, and sell across channels from one place. eBay listing management features let you edit each product’s price, inventory level, shipping and return policy, and category placement.

Marketplace Connect helps businesses keep on top of regular listing updates and revisions, which tells the algorithm that the listing is active. Marketplace Connect order syncing automatically imports eBay orders into Shopify. Here, businesses can list and sell items on eBay using Cassini-friendly strategies while keeping orders on Shopify as a central platform for unified order management.