Can whatever method that etherchain are using to access and query the blockchain data also be leveraged by the average web developer in a garden variety web app using a remote call? Or, are etherchain running a full node on their back end?
Is there such thing as Ethereum node hosting, such that web apps could be deployed and by way of web3.js, query transaction data and display smart contract state? Perhaps Azure's BaaS or BlockApps could be used to achieve something like this? Maybe Metamask is what I'm looking for?