The company is a subsidiary of Keynetics, and is the sister company of Kount, an online security company. It was founded in 1998 by Tim and Eileen Barber.
In 2011, the site had attracted over 1,500,000 affiliate marketers, approximately 100,000 of whom were designated as 'active' at any given time. In June 2011 the company claimed to have paid affiliates and vendors over $1.8 billion, processed 35,000 transactions per day, and generated over $350M in annual revenue. It offered over 46,000 individual products to its affiliate marketers, and provided services in over 200 countries.