- Index Calculation Rules

To ensure the spot index price accurately reflects the spot market price of each token, we have carefully selected the market prices of 3 or more major exchanges as the weighted index constituents for each token. Measures are introduced to handle abnormal situations. 

Spot Index Constituents

Token	Exchange	Trading Pair	Weight
BTC	GDAX GEMINI Bitstamp Kraken	BTC/USD   BTC/USD   BTC/USD   BTC/USD	25%   25%   25%   25%
ETH	Kraken Bitfinex Coinbase Bitstamp	ETH/USD   ETH/USD   ETH/USD   ETH/USD	25%   25%   25%   25%
EOS	Huobi OKex Binance Bitfinex	EOS/BTC   EOS/BTC   EOS/BTC   EOS/BTC	25%   25%   25%   25%
LTC	Coinbase Bitfinex Bitstamp OKex Huobi Binance	LTC/USD LTC/USD LTC/USD LTC/BTC LTC/BTC LTC/BTC	16.7% 16.7% 16.7% 16.7% 16.7% 16.7%
XRP	Coinbase Kraken Bitstamp Bitfinex Binance Huobi	XRP/USD XRP/USD XRP/USD XRP/USD XRP/BTC XRP/BTC	16.7% 16.7% 16.7% 16.7% 16.7% 16.7%
BCH	Coinbase Bitfinex Kraken Birstamp Huobi Binance	BCH/USD BCH/USD BCH/USD BCH/USD BCH/BTC BCH/BTC	16.7% 16.7% 16.7% 16.7% 16.7% 16.7%

Index Update Rules:

• If an exchange data source stops updating or is inactive for a long duration, we will temporarily remove it from index calculation until it starts updating data again.
• The number of active exchanges (deduced from a):
  • >=3 exchanges, weighted average index price of these active exchange prices ( If an exchange's price deviates 3% or above from all exchanges' median, then this exchange's price will be the median * 1.03 or median * 0.97)
  • =2 exchanges, average of prices 
  • =1 exchange, that exchange price.
• For XXX/BTC trading pairs in the index components, it will be multiplied by Dsdaq BTC index and calculated.