Selling successfully on eBay requires more than uploading products and waiting for buyers to find them. Visibility in eBay search depends heavily on how well a listing matches buyer intent and how effectively the seller meets eBay’s expectations for listing quality, pricing, shipping, and customer service.

The search system is commonly referred to as Cassini, while eBay’s current public documentation describes the default search experience as Best Match. eBay states that Best Match considers factors including search relevance, item popularity, price, listing quality, listing completeness, selling terms, and the seller’s track record.

Understanding these factors can help sellers build better listings and improve their chances of reaching relevant shoppers.

What Is the eBay Cassini Algorithm?

Cassini is widely used as the name for eBay’s search-ranking technology, but sellers should focus on the current Best Match principles rather than assuming there is one fixed ranking formula.

eBay explains that its Best Match algorithm is designed to show shoppers listings that most closely match what they are looking for. The system considers multiple signals rather than relying on a single keyword or ranking factor. eBay also notes that the algorithm is regularly updated, meaning optimization should be based on current seller guidance and marketplace performance rather than outdated tactics.

For sellers, this means there is no single “Cassini trick.” The better approach is to create relevant, complete, competitive, and buyer-friendly listings.

1.Search Relevance Is a Major Ranking Factor

The first step toward eBay search visibility is relevance. Your listing needs to clearly communicate what the product is and match the language buyers use when searching.

eBay recommends clear and concise titles, accurate descriptions, and complete item specifics. Sellers should use relevant product information rather than filling titles with unnecessary keywords. eBay currently recommends keeping titles to no more than 80 characters.

For example, a seller offering a specific shoe should identify the brand, model, style, size, colour, and other important attributes where appropriate. Item specifics can help eBay understand the product and connect it with relevant searches.

This makes eBay SEO more about accurate product information than traditional keyword stuffing.

2.Listing Completeness Helps eBay Understand Your Product

A complete listing gives eBay more information to work with. Sellers should fill in relevant item specifics, choose the correct category, provide accurate descriptions, and include useful product images.

eBay specifically recommends adding item specifics such as make, model, size, colour, and style. It also recommends high-quality photos from different angles and accurate descriptions.

For sellers targeting buyers in Canada and the USA, complete product information can also help customers make purchasing decisions with greater confidence.

The more accurately a product is represented, the easier it is for the marketplace to connect the listing with an appropriate search.

3.Price and Shipping Can Influence Visibility

Price is another factor considered by Best Match. However, sellers should not automatically assume that the cheapest listing will always rank first.

eBay’s guidance emphasizes competitive pricing along with reasonable shipping and strong customer service.

A competitive offer should therefore be evaluated as a complete package. Product price, shipping cost, delivery expectations, return terms, and overall buyer value can all influence how attractive a listing is.

Using eBay’s Product Research tool can help sellers compare pricing, sales trends, competition, and product performance using marketplace data.

4.Sales and Product Popularity Matter

eBay states that item popularity is one of the factors considered by Best Match. This means sellers should think beyond simply getting impressions.

A listing needs to attract the right shoppers and convert that interest into sales. Accurate titles, strong images, useful descriptions, competitive offers, and complete item specifics can all contribute to a better customer experience.

eBay’s developer documentation also notes that an item’s performance score, including the relationship between sales and impressions, can affect its search position.

This highlights an important principle: eBay search optimization and conversion optimization are closely connected.

5.Seller Performance and Customer Experience Matter

Your seller track record is another factor eBay considers. Strong customer service, accurate product descriptions, reliable handling, and successful deliveries can support a healthier selling history.

eBay recommends ensuring items reach buyers on time, using tracking where possible, describing products accurately, and keeping inventory updated to avoid cancelling sales.

For sellers trying to improve their eBay Best Match ranking, optimizing listings while neglecting customer experience is therefore unlikely to produce sustainable results.

6.Images and Listing Quality Can Affect Performance

Product photography plays an important role in helping shoppers understand what they are buying. eBay recommends high-quality images that show products from different angles and clearly reveal relevant flaws or imperfections.

Strong images can improve the shopping experience because customers can evaluate the product before purchasing. This is particularly important for competitive categories where several sellers offer similar products.

For professional eBay sellers, product photography should therefore be treated as part of the overall marketplace SEO and conversion strategy.

7.Use eBay Product Research to Refine Your Strategy

Guesswork is not the best way to optimize an eBay store. eBay’s Product Research tool provides sellers with information about recent marketplace sales, pricing trends, competition, and product performance.

Sellers can use this information to identify products with demand, evaluate competitors, compare prices, understand item-specific trends, and identify opportunities to refresh underperforming listings.

This data-driven approach can make eBay SEO more practical because sellers can base optimization decisions on actual marketplace activity.

How to Optimize for eBay Best Match

The strongest strategy is to build every listing around buyer intent. Start with accurate keyword research, then create a concise title that describes the product clearly. Complete all relevant item specifics, select the most appropriate category, use high-quality photographs, and write an informative description.

Next, review pricing, shipping, handling time, and return policies. Monitor views and sales performance, and use eBay’s research tools to compare your listings with competitors.

Most importantly, avoid outdated “algorithm hacks.” eBay explicitly says there is no secret formula for improving Best Match position and recommends following strong listing and selling practices.

Final Thoughts

Understanding the eBay Cassini algorithm today really means understanding how Best Match works. Relevance, popularity, price, listing quality, completeness, selling terms, and seller performance all contribute to how listings are positioned.

For sellers targeting customers in Canada, the USA, or other eBay marketplaces, the goal should be to create listings that are easy to understand, attractive to buyers, competitive, and supported by reliable service.

AMZ Northland helps businesses strengthen their eCommerce and marketplace presence through services such as marketplace management, listing optimization, product content, product photography, and eCommerce growth strategies. A well-optimized eBay presence combines strong marketplace SEO with accurate product information, competitive positioning, compelling presentation, and consistent seller performance.