2Key network is a blockchain based platform for building referral campaigns. 2Key allows users to create and manage online campaigns that are powered by smart contracts. The Ethereum based 2KEY token is used to activate campaigns and to reward users for their participation.

ClearCoin is developing a smart contract based advertising and media buying platform, built on Ethereum. Powered by the XCLR token, ClearCoin connects advertisers and publishers in a media buying network that uses blockchain to add efficiency and transparency to the media buying process.