Every marketplace we reach, and what each one gives.
The set is in order of how much of the question each surface answers. Size and demand are separate columns on purpose. A count of a catalog is not a count of a market.
Tier 1 · answers the question
Each product has a daily and weekly record of units sold, average sale price, and transaction count. This is the one marketplace that publishes real demand.
A category tree of 35 nodes. A seller ranking for each category over three time windows. Public seller totals. The full category sale value opens with a partner login.
Live listing counts and full search results across 1,454 category nodes. The sold-price records need an account login.
A full category tree and brand-level listing counts. Likes, shares, and offers give an interest signal.
A base of 19.5 million releases with genre, style, and format filters. Want and have counts give a standing-interest signal.
Tier 2 · depth and supply
A catalog of 609,882 listings across 541 brands and 17,254 models. Price history by size.
1,348 category and brand pages with price by grade: fair, good, and excellent, across handset and laptop lines.
84 departments with counts and prices. Dated reviews give a demand signal on the closest general rival to Amazon.
3,190 categories and 25,110 brands. A structural map of the US and Japan resale shelf.
Public categories and catalog supply. The market bid and ask values need an interface key, so the price spread is estimated.
New-arrival and price cards from the storefront, tracked as an assortment-speed signal.