The current difficulty is 690.4 PH. The next difficulty is estimated at 690.9 PH, a change of +0.08%. The difficulty changes globally every time a new block is mined, based on how fast blocks are being found.
Hash Price Report
The last block was at height 190,118. The current block reward is 109,881 SC. Based on this and on the current difficulty, miners are being paid 154.3900 SC/PH, which corresponds to about 13.34 SC/day per GH/s.