We started CSPA Index service for digital currencies price average. From now on, The BTC/USD average price displayed at the Coinhills front page has been changed its name as CSPA:BTC. This index is representing the 'Coinhills Spot Price Average' Index.
It is calculated by the data gathered from various digital currency exchanges globally. When the data arrived, every price is converted to USD counter value and it is weighted by the 24 hour trade volume of each market. And then all those are combined as one global average value. For a long time, we had hard time to make it stable and reliable. Currently, over 80 global digital currency exchanges are registered at Coinhills.