Adshares is developing a blockchain-based platform for programmatic advertising. They're goal is to create a decentralized marketplace to connect publishers and advertisers. Their advertising platform is based on their own blockchain, which is called the Enterprise Service Chain. It has a dPoS consensus mechanism and is powered by the native ADS coin.

AdCoin is an ad network for cryptocurrencies. It was created to allow cryptocurrency related products to be advertised more transparently, with digital ad campaigns that will reach their target demographic. The company is developing plugins, API's and other tools that can be used to connect publishers and advertisers, in a crypto-powered ad exchange.
There are no minimum budgets for campaigns. The network that is fueled with the ACC coin, which has a Proof-of-Work (PoW) consensus protocol.

MetaX is an AdTech company that is developing a blockchain-based digital advertising platform. They created adChain and adToken to serve as a decentralized solution for digital advertising. Their Ethereum-based adToken (ADT) powers the adChain registry.