Cassini: the algorithm that decides who sees your eBay listing
Every time a buyer searches for something on eBay, a search engine decides which listings show up first — and which ones almost nobody ever sees. Here's how it works, and how ListBanana builds every listing to give you more chances of being found.
🔎 What is Cassini?
Cassini is eBay's internal search engine: the technology that reads what a buyer types into the search bar and decides, in milliseconds, which listings to show first.
That order is everything. A listing that shows up in the first results gets far more impressions and views; one buried several pages down barely gets seen, even if the product is excellent. That's why two people with the same product at the same price can get completely different results: often what was wrong wasn't your product — it was how you listed it.
🏆 What does Cassini reward?
eBay doesn't publish its algorithm's exact formula — nobody outside eBay knows it from the inside. But the best practices eBay itself recommends to sellers always point to the same thing: relevance and listing quality. These are the signals that matter most:
A title with the words buyers actually search
Cassini matches your title against what people type. Brand, model, size, color, material: the more your title matches real searches, the more chances your listing has to show up.
The right category
Listing in the wrong category is like shelving a book with the shoes: even with a great title, many searches and filters will never reach your listing.
Complete item specifics
Item specifics (brand, size, color, type, material…) power eBay's search filters. Every empty field is a filter where your listing simply doesn't appear.
Product identifiers
The UPC, brand or MPN help eBay know exactly which product it is, connect it to its catalog and show it in the right searches.
A complete description
A clear, complete description gives the search engine context and the buyer confidence — and both count.
Good photos
Photos don't just convince the buyer: a listing with quality photos earns more clicks and better interest signals, and that matters too.
A competitive price
A price in line with the market gets more buyers clicking and tells the system your listing is a relevant option.
What about Facebook Marketplace?
Let's be straight: Facebook Marketplace does NOT use Cassini — Cassini is eBay technology. Facebook has its own ranking system, and it doesn't publish how it works on the inside either.
The good news is that it rewards very similar signals: a clear title, the right category, good photos and a complete description. A well-built listing works in your favor on both platforms.
🍌 How ListBanana builds your listings so you get found
Taking care of all those signals by hand, listing after listing, takes hours — and that's where most people end up cutting corners. ListBanana builds them into every listing automatically:
- 1
Optimized titles with the keywords buyers actually use, making the most of the available space.
- 2
The right category and complete item specifics, suggested by the AI from your photos — you confirm everything before publishing.
- 3
Complete, well-organized descriptions, AI-generated and always editable.
- 4
Research-informed pricing: you see real eBay market data before deciding your price.
⚡ Our differentiator: speed without sacrificing quality
There are fast tools that put out weak listings, and flawless listings that take an hour each. ListBanana gives you both: you publish 10x more in a fraction of the time AND every listing comes out well-built with the signals the algorithms reward. More well-made listings means more chances of being found and bought — and you get your time back to focus on finding winning products.
🤝 No smoke, ever
Nobody outside eBay controls or fully knows Cassini, and nobody can guarantee you rankings or sales — be wary of anyone who promises that. What IS in your hands (and ListBanana automates) is publishing complete, relevant listings — exactly what the platforms say they reward. Cassini is technology of eBay Inc.; ListBanana is not affiliated with eBay or Meta.
Publish listings that actually get found
Start with 3 free listings: one photo, the AI builds the listing with the signals the algorithms reward, you approve and list in minutes.
Create my first listing 🍌Available on your phone — the app is on the App Store and Google Play — or from your computer at listbanana.com. Publishing to Facebook Marketplace requires a computer with Chrome and the ListBanana extension. For now, United States only.
