I didn't check for the accuracy of the calculations but what I see is a great idea superbly executed. Impressive.
thanks!
They are accurate, and becoming even more precise as we add additional exchanges to calculate volume-weighted average. Now, for example, LTC/BTC rate is being calculated across 11 exchanges every 30 seconds
BTC-E
Cryptsy
BitFinex
Crypto-trade
Vircurex
Bter
Hitbtc
Poloniex
Coins-E
Crypto Rush
Atomic Trade
and counting...!