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Minercluster
https://www.minercluster.com/?ref=b461736077d2f275fc413d61728a5f05
sign up for free 135GH/s
min. Withdraw 0.00025 BTC
HashZed
https://hashzed.com/?ref=29211
sign up for free 150GH/s
min. Withdraw 0.0015BTC
Hashbitmining
https://hashbitmining.com/?ref=21624
sign up for free 150GH/s
min. Withdraw 0.0003BTC
Ryse
https://ryse.cc/ref?id=cless951215
sign up for free 100GH/s
Crypto BTC Miner
https://cryptobtcminer.com//?ref=362f58d534cc809e559d3f2482940e9e
sign up for free 200 GH/s