study(title="(BitFlyer+Bithumb+Coinbase+Bitstamp+Kraken)/(Bitmex+Bitfinex+BitFlyer+Bithumb+Coinbase+Bitstamp+Kraken) BTC Volume", overlay=false)

// Inputs
timeframe = input(title="Timeframe", type=string, defval='D')
BitfinexVol = security("BITFINEX:BTCUSD", timeframe, volume) // 1 Min
CoinbaseVol = security("COINBASE:BTCUSD", timeframe, volume) // 1 Min
BitstampVol = security("BITSTAMP:BTCUSD", timeframe, volume) // 1 Min
BitmexVol = security("BITMEX:XBTUSD", timeframe, volume)/security("BITMEX:XBTUSD", timeframe, close) // 1 Min
KrakenVol = security("KRAKEN:XBTUSD", timeframe, volume)/security("KRAKEN:XBTUSD", timeframe, close) // 1 Min
BinanceVol = security("BINANCE:BTCUSDT", timeframe, volume) // 1
BithumbVol = security("BITHUMB:BTCKRW", timeframe, volume) // 1
FlyerVol = security("BITFLYER:BTCJPY", timeframe, volume) // 1

// Plot the values on the chart
plot(series=(FlyerVol+BithumbVol+CoinbaseVol+BitstampVol+KrakenVol)/(FlyerVol+BithumbVol+BitmexVol+BitfinexVol+CoinbaseVol+BitstampVol+KrakenVol), style=line,
    color = blue, linewidth=1)