Groupon

Groupon is a deals marketplace based in the United States, offering discounted vouchers for local experiences, restaurants, services and products. Consumers browse deals by city and category, buy a voucher and redeem it with the participating business.

Local merchants use the site to reach new customers by offering a limited-time discount, while shoppers use it to find deals on things to do or buy nearby. Its ads.txt file lists 132 ad systems, combining direct arrangements and resellers, with sales run through operators including Freestar, Seedtag Advertising, PixFuture Media, VDO.AI and Insticator.