I tried hard to search mining sites that have shown proof of payment by people. I also don't want to waste on non-paying sites too.
As of this writing, these sites are paying:
1. Mastercoin (free 1000 GH/s)
2. Hashrapid (free 3 spins to win Btc)
3. Solidminer
4. Saylex (free 300 GH/s)
5. Ethonline.io
6. Miningcheap.io
Just let them run. Most of these are fast except solidminer.
As of this writing, these sites are paying:
1. Mastercoin (free 1000 GH/s)
2. Hashrapid (free 3 spins to win Btc)
3. Solidminer
4. Saylex (free 300 GH/s)
5. Ethonline.io
6. Miningcheap.io
Just let them run. Most of these are fast except solidminer.