eBay SEO: How Cassini Ranks Your Listings

eBay's search engine decides which listings a buyer sees, and it does not think like Google. It is called Cassini, its default sort order is Best Match, and eBay publishes what it weighs - so you can optimize for the real factors instead of folklore.

What is Cassini on eBay?

Cassini is the name for eBay's internal search engine. When a buyer types a query, Cassini pulls the listings that match the words used, then orders them with the Best Match algorithm. eBay states plainly that Best Match considers:

• How closely the listing matches the buyer's search terms
• How popular the item is
• The price of the item
• The quality of the listing - description, photos, and so on
• How complete the listing is
• Listing terms of service, such as return policy and handling time
• Your track record as a seller

eBay also says it updates Best Match over time, so no outside formula stays accurate forever - including anything you read here. The seven factors above come from eBay's own help pages and are the honest core of eBay SEO.

Cassini vs. Google: stop optimizing for the wrong engine

Sellers with Google SEO experience often apply the wrong playbook. Cassini is not ranking web pages against each other; it is predicting which listing a buyer will actually purchase.

Practical takeaway: keywords get you matching into results, but buyer behavior decides your position. A listing that matches and converts will outrank one that merely matches often.

Keyword research the eBay way

eBay keyword research starts with buyer language, not volumes from an SEO tool:

1. Search your item on eBay and note the search suggestions the site completes for you - those reflect actual buyer queries.
2. Open the sold listings for your item and read the titles of what actually sold. Those words are the proven vocabulary.
3. Check the item specifics eBay suggests in the listing form for your category: the field options mirror the filters buyers use.

If you source an item you cannot identify to this level of detail - no brand, no model, no size tags - all of this gets harder. That is why good label shots matter: they are the input to both identification and accurate keywords. Our photo guide covers the shots; a photo-to-listing app can do the identification and comp research for you.

Titles: the highest-weight keyword field

Your 80-character title is where relevance matching begins. The working structure: brand, model or line, item type in plain words, key attributes, size and color - no filler, no symbol games, no keyword stuffing. eBay's guidance warns against writing words in all caps or adding asterisks between words, because those practices can lower ranking.

The titled-word craft, structure, and mistakes are covered in depth in how to write eBay listing titles that get found.

Item specifics are filters, not decoration

Every blank item specific is a filtered search you drop out of. When a buyer narrows results by size, color, brand, material, or style, eBay needs the matching specific on your listing to include it. eBay's own help treats item specifics as required structured data in many categories, which is why "complete listing" is one of the published Best Match factors.

Brand and model numbers are the two most valuable specifics to get right on secondhand goods, and they come from the label shots in your photos. The field-by-field approach is in the eBay item specifics guide.

Photos and description sell the click

Listing quality is a published factor: accurate description, photos from every angle, and disclosed flaws. Photos do double duty - they support ranking through listing quality and they convert the click you worked to earn. The complete approach is in how to photograph items for eBay.

The description matters less for matching (Cassini matches on title and specifics by default) and more for conversion, which feeds back into visibility. Write it for the buyer's decision, not for keyword density.

Price, shipping, and the total cost picture

Cassini weighs price because overpriced listings do not convert, and conversion is the core signal. Two disciplines keep you priced where eBay wants you:

• Price from sold comps, not from other sellers' asking prices. The method is in the sold comps guide.
• Compete on total cost: item price plus shipping. Free or reasonable shipping and faster handling times are Best Match recommendations in eBay's own checklist.

Seller performance and returns policy

Your track record is a ranked factor, and eBay lists your terms of service - return policy, handling time - among the inputs. Sellers offering 30-day returns generally face lower ranking risk than no-returns listings, because eBay weighs buyer safety and satisfaction. Fast, reliable fulfillment protects the service metrics that feed your visibility over time. Returns, handled properly, are part of SEO's bigger budget; the practical handling workflow is in handling eBay returns.

Promoted Listings: what they fix and what they don't

Running Promoted Listings can add visibility, especially where organic competition is dense. What it does not fix is an unpaid listing's core problem: if the title and specifics miss the buyer's words, paid placement still competes in a pool filtered by relevance. Promote listings that already match well; treat ads as leverage, not as SEO repair work.

FAQ

How do I get my eBay listing to the top of search results?

Match the search and make buyers choose you: keywords from sold comps in the title, complete item specifics, quality photos, competitively priced sold-comp values with reasonable shipping, and clean seller metrics. There is no secret beyond eBay's published Best Match factors - the sellers ranking highest are the ones executing all of them consistently.

Does eBay search include the description?

By default, eBay search matches against the title and item specifics. Buyers can run a search including listing descriptions through eBay's advanced search, treating it as a fallback rather than a ranking channel. Write the description for the human who already found you.

What is the fastest fix for a listing that gets no views?

Work the same checklist in order: search your title on eBay as a buyer would (do relevant items appear?), then verify item specifics, then improve the first photo, then compare total price against sold comps. Most "invisible listing" problems resolve in one of those four places.

Does ending and relisting improve ranking?

Not reliably. Freshness helps in the sense that updated, active listings get seen, but relisting resets any listing-level history and adds work. Fix the factors instead, and put the effort into pricing, photos, and specifics.