Start narrow.
Use a model number, brand, size, grade, or condition filter. Broad keywords can hide weak demand behind a few unrelated winners.
eBay demand calculator
eBay sell-through rate calculator.
Estimate whether an eBay keyword has enough sold comps, demand velocity, and monthly revenue before you source more inventory.
Sold listings analyzed
32,272,620
Current 30-day eBay sold listing cache.
Average sold price
$72
Use this as a default if you do not have exact comps yet.
Top product
2025 26 topps cosmic chrome
2,196 observed sales.
Top brand
Topps
$13,530,951 observed revenue.
Dataset updated through May 20, 2026.
Sold comps math
Turn active and sold counts into a sourcing signal.
Search a product on eBay, count active listings and sold listings for the same window, then calculate demand depth before you buy.
Resellbot eBay data
Use sell-through with real sold listing volume.
In the latest 30-day Resellbot eBay dataset, the cache includes 32,272,620 sold listings and $2,322,561,157 in observed revenue. That makes it useful for building a first-pass watchlist before narrowing down to exact comps.
A high sell-through rate still needs margin. Use the eBay fee calculator after you identify demand.
How to use eBay sell-through rate.
Match the window.
A 30-day active count should be compared with a 30-day sold count. Mixing windows inflates or depresses the signal.
Check margin last.
Sell-through answers demand. Fees, shipping, returns, and cost of goods decide whether the item is worth buying.