The current difficulty is 914.9 PH. The next difficulty is estimated at 918.6 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 15,738. The current block reward is 227,408.8 SCP. Based on this and on the current difficulty, miners are being paid 241.0948 SCP/PH, which corresponds to about 20.83 SCP/day per GH/s.