Marketplace seller data

Marketplace seller data describes the third-party sellers active on online marketplaces: who they are, what they sell, how they price and roughly how much they sell. Brands use it to find unauthorized resellers and protect pricing, agencies and service providers use it to find and recruit sellers, and investors use it to follow online categories and brand momentum.

Typical fields

• Seller ID, storefront name and marketplace
• Business name and country where published
• Number of active listings and main categories
• Ratings, review counts and feedback history
• Estimated units and revenue per product or seller
• Fulfilment method and first-seen date

Sources and collection

Data is collected from public seller storefronts, product pages and offer listings, and from business details that marketplaces display under consumer protection rules. Sales figures are almost always estimates, modelled from signals such as sales-rank movement, review velocity and stock changes, then calibrated against known sales from partner sellers.

Delivery and pricing

Expect monthly or weekly files, an API, or a web app for searching sellers. Price depends on the marketplaces and countries covered, the number of sellers and products tracked, and whether sales estimates are included. Seller lists used for outreach may come with separate usage rules.

Before you buy

• Confirm which marketplaces and country storefronts are covered.
• Ask how sales are estimated and how accurate the model is against known figures.
• Check whether seller contact details are business information and how they were obtained.
• Ask how sellers with several storefronts are linked.
• Check how quickly new sellers and closed storefronts are reflected.