eBay’s Cassini Algorithm Is Not Your Enemy — Here Is Exactly How to Rank Higher Without Paying More

Sellers blame eBay’s algorithm for low visibility without understanding what it actually rewards.

Here is what every business owner needs to know about ebay’s cassini algorithm is not your enemy — here is exactly how to rank higher without paying more, broken down into the questions that matter most.

How does eBay’s Cassini search algorithm differ from Amazon’s A9?

Cassini prioritizes Best Match — a blend of recency, completeness, seller performance, and conversion probability — whereas Amazon focuses almost entirely on conversion rate. On eBay, a listing with a 95% seller rating, complete item specifics, and 30-day sales history will outrank a cheaper listing with incomplete data. Cassini rewards commitment to the platform.

What are item specifics and why do they matter so much?

Item specifics are the structured attribute fields eBay provides per category. Listings with all item specifics filled in rank 20-50% higher than those with partial data because Cassini uses them to match search queries. A listing with all 12 item specifics filled will outrank one with only 3, even at a lower price.

Does listing format affect Cassini ranking?

Fixed-price listings (Buy It Now) receive preferential treatment in search for most categories. Auctions now represent less than 10% of eBay transactions. Cassini favors fixed-price listings because they keep inventory visible longer. Use auctions only for unique collectibles, clearance items, or to build initial sales velocity on a new account.

How does seller performance rating impact my search ranking?

Your seller rating is a direct ranking signal. Top Rated Sellers get a 30%+ visibility boost in search results and a badge that increases click-through rates by 15-25%. eBay also charges Top Rated Sellers a 10% final value fee discount. Maintaining a 98%+ positive feedback rate and less than 1% defect rate is non-negotiable.

What is the ideal listing duration for Cassini optimization?

Good ‘Til Cancelled (GTC) auto-renewing listings are the standard and receive the best ranking. Cassini penalizes 30-day listings because they expire and create a poor buyer experience. Set every listing to GTC, and eBay’s algorithm will reward your consistency with higher steady-state ranking.

How do returns and refunds impact my Cassini ranking?

Cassini heavily weights trust signals. A return rate above 5% for your category triggers a visibility penalty that can drop your listings by 2-3 pages. Proactively offer 30-day returns — listings with free returns rank higher and get a ‘Free Returns’ badge that increases conversions by 8-12%.

Should I use eBay’s Promoted Listings to improve organic ranking?

Promoted Listings increase visibility but don’t directly improve organic Best Match ranking. However, the additional sales improve your listing’s conversion velocity, which Cassini reads as a positive signal and boosts organic rank. Use Promoted Listings as a catalyst on your top 20 items to accelerate sales velocity.

How often does Cassini recalculate rankings?

Cassini updates ranking in near-real-time based on recent sales velocity. A listing with 3 sales in an hour will temporarily spike to the top of search results. This is why timing new listings to go live during peak shopper hours (7-9 PM EST) is critical — Cassini gives new listings a 24-hour boost.

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