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
@amritabithi's https://bitcoinapi.io 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.