| getCryptoCurrency | R Documentation | 
Download cryptocurrency daily time series from Alpha vantage using either a free or premium API key. Includes open high low close, volume and market cap.
getCryptoCurrency( symbol = "BTC", market = "USD", datatype = "json", key = "premium" )
| symbol | cryptocurrency symbol, i.e. "BTC" (string) | 
| market | physical currency symbol for quoting i.e. "USD", "CNY", etc. | 
| datatype | "json" or "csv" for return type to be parsed | 
| key | string for the API key to use Alpha Vantage | 
xts object
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