I received my Staker STR reward last Sept 17, 2018 as part of the 13th of 40 week of airdrop, Staker is the First Proof of stake smart contract in ethereum platform, you can earn daily Str without your wallet desktop wallet open since Staker is in ether wallet. you can check your balance using their staker calculator and withdraw it in time you need. staker also launching a new project cee-lo dice game where you play, have fun, earn str and many more.