The current difficulty is 7,938 PH. The next difficulty is estimated at 7,970 PH, a change of +0.40%. 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 307,653. The current block reward is 30,000 SC. Based on this and on the current difficulty, miners are being paid 3.6660 SC/PH, which corresponds to about 0.32 SC/day per GH/s.