Mercari

Mercari is an online marketplace where individuals list items for sale to other users, covering categories such as clothing, electronics, collectibles and household goods, alongside new merchandise offered by some sellers. Buyers browse and purchase directly from other users, with the platform facilitating payment and shipping arrangements between the two sides of each transaction from listing through delivery, and handling returns when needed.

Its ads.txt file lists 27 ad systems, made up of 5 direct relationships and 25 resellers, reflecting a mix of direct-sold and programmatic advertising placed across the marketplace's pages.