eBay product research tools: what their data can tell you, and what it cannot

What can eBay product research tools tell you?

eBay product research tools turn eBay's sales history into numbers you can compare: how many of an item sold, at what prices, how many sellers sold it and how quickly listings converted. That makes them very good at one question: has this product sold on eBay recently, and at what price? They are much weaker at the questions that decide whether you should sell it: will it keep selling, what will you make, and can you get it reliably and within eBay's rules?

This guide compares the main kinds of research tools, explains what each kind of number means, and sets out the checks the data cannot do for you. It applies to sellers on eBay.co.uk and eBay.com.

Which kinds of eBay product research tools are there?

Research tools fall into a few groups, depending on where their data comes from.

eBay's own Product research

eBay describes Product research (formerly Terapeak) as a free tool with three years of eBay sales and pricing data. On desktop you need to be opted in to Seller Hub, which needs at least one sale; then open the Research tab, where Product research is the first option. eBay lists what it shows: actual sold prices including accepted Best Offers, average sold price, sold price range, the share of sales with free postage and the average postage, the number of sellers who sold the product, a price trend graph and a sell-through rate. Read eBay's description on the Seller Centre Product research page. Our guide to using Terapeak product research walks through the screens.

Third-party tools

Third-party tools can scan more products faster and add their own scores. Before you trust a score, ask three questions: where does the sales data come from, how old is it, and what does the score actually measure? A score you cannot explain is a guess with a number on it.

What does each number really mean?

• Average sold price: the middle of past sales. It hides spread, so look at the sold price range too. An average of £20 can come from many sales at £15 and a few at £40.
• Sell-through rate: eBay describes it as the share of similar items sold in a set period. High sell-through means listings tend to convert; it does not mean there is room for one more seller. See our guide to calculating eBay sell-through rate.
• Number of sellers: how crowded the item is. Many sellers at similar prices usually means a price race.
• Free postage share: how many sales included free postage. If most did, buyers expect it and you need to build postage into your price.
• Price trend: whether prices are rising, falling or steady. A falling trend can mean a newer model has arrived.

A worked example

Example, with hypothetical numbers: suppose research for a phone stand over 90 days shows 120 sold, 80 listings that ended without selling, an average sold price of £11.50, 14 sellers, and 85% of sales with free postage. Sell-through, as sold divided by sold plus unsold, is 120 divided by 200, or 60%. Spread over 14 sellers, that is fewer than nine sales each in 90 days, or under one a week each. Demand is real, but a fifteenth seller should expect a small share unless they bring something better: a lower cost, faster delivery or a better listing.

What can't eBay product research tools tell you?

This is the part most research guides skip. Each item below needs a check of your own.

Future demand

All sales data is history. A product that sold well last quarter may be seasonal, may have peaked, or may be about to be replaced. Look at the trend line and the time of year, and be wary of a sudden spike.

Your margin

A sold price is not profit. You need your cost, eBay's fees for that category and seller type, any ad rate, postage and returns. Fees vary, so take them from eBay's current fee pages, then work out the price you need and compare it with the sold price range.

Why items sold

The data shows that a listing sold, not why. The seller may have had strong feedback, fast delivery, a promoted listing or an unusually low price for a short time. Open a few of the top sold listings and look at how they were listed.

Whether you may sell it

Research does not check rights. A branded item may be one whose rights owner reports listings through eBay's VeRO programme, and some items are restricted in some categories or countries. Check the brand and the item before you list.

Whether your supply is reliable and allowed

A product is only worth listing if you can get it at your cost, in time, every time. If you plan not to hold the stock yourself, read eBay's drop shipping policy first: fulfilling orders directly from a wholesale supplier is allowed, but listing an item and then buying it from another retailer or marketplace that ships directly to your buyer is not allowed. See eBay's drop shipping policy page. Whatever your supply, you stay responsible for delivery within the stated time and for the buyer's satisfaction.

Should you research eBay UK and eBay US separately?

Yes. Each eBay site is its own market, with its own buyers, prices, currency and competition. An item that sells steadily on eBay.com may barely sell on eBay.co.uk, or the other way round, and postage expectations differ between the two. Research the site you will sell on, and if you plan to sell on both, run the numbers for each one.

Check three things when you compare:

• The currency of every figure. A sold price of 20 means very different things in pounds and dollars, and your costs will be in one currency or the other.
• Postage. Average postage and the share of free postage tell you what buyers on that site expect to pay to receive the item.
• Who you compete with. The sellers on each site differ, and so does how fast they deliver.

If you sell across sites, remember that eBay's seller currency conversion charge applies when eBay converts your funds. For UK sellers it is 2.5%, rising to 2.75% from 1 December 2026, so include it when you compare margins between the two sites.

How should you use research data to choose a product?

Use the tools to build a shortlist, then put each product through the checks the data cannot do.

1. Search the item in Product research for the last 90 days and the last year, to see both recent demand and seasonality.
2. Note the sold price range, sell-through and number of sellers. Drop items with very few sales or a crowded field at a price you cannot match.
3. Open five sold listings and note their delivery times, photos, titles and feedback.
4. Work out your break-even price from your real cost, fees, ad rate and postage.
5. Check the brand and item against VeRO and eBay's prohibited and restricted items rules.
6. Confirm supply: cost, stock depth, delivery time and that your model fits eBay's policies.
7. List a small number first and watch views, sales and returns for a few weeks before adding more.

For a fuller routine, see how to find winning products on eBay.

What to do next

Pick three products you are considering and run them through the seven steps above, writing the numbers in one table. You will usually find that one fails on margin, one on competition or rights, and one is worth a test. Repeat the process weekly with a fresh shortlist, and judge each test by your own sales and profit after a few weeks, not by the research score that put it on the list.