Bitchat by unwriter, is a Massively Multiplayer Global Realtime Chat over Bitcoin. All messages are OP_RETURN transactions. But what's unique is: It's FREE. No need to pay or think about wallets.

The reason why this is FREE is because it's powered by 's API People haven't yet realized how crazy this API is, Basically you just make a GET or POST request to the API and it PAYS FOR THE TRANSACTION FOR YOU and sends it to Bitcoin, for FREE

 Just type "/refill" to trigger the command in order to donate.