SAN FRANCISCO, July 24, 2017 -- Cardpool, Inc., a leading gift card exchange company owned by Blackhawk Network, today announced Cardpool Marketplace, an ecommerce platform that enables sellers to list their pre-owned gift cards on Cardpool.com's website alongside Cardpool's inventory of gift cards. When selling a gift card, customers can accept a direct purchase offer from Cardpool or instead, list their gift card for sale at the price of choice on Marketplace for other buyers to purchase. This additional service gives customers more ways to unlock value from their gift cards.