class_docstr: This class implements all the crypto currencies api calls
      
docstr: Returns the realtime exchange rate for any pair of digital
  currency (e.g., BTC) or physical currency (e.g., USD).
  Keyword Arguments:
      from_currency: The currency you would like to get the exchange rate
      for. It can either be a physical currency or digital/crypto currency.
      For example: from_currency=USD or from_currency=BTC.
      to_currency: The destination currency for the exchange rate.
      It can either be a physical currency or digital/crypto currency.
      For example: to_currency=USD or to_currency=BTC.
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code: def get_digital_currency_exchange_rate(
      self, from_currency, to_currency
  ):
      """Returns the realtime exchange rate for any pair of digital
      currency (e.g., BTC) or physical currency (e.g., USD).
      Keyword Arguments:
          from_currency: The currency you would like to get the exchange rate
          for. It can either be a physical currency or digital/crypto currency.
          For example: from_currency=USD or from_currency=BTC.
          to_currency: The destination currency for the exchange rate.
          It can either be a physical currency or digital/crypto currency.
          For example: to_currency=USD or to_currency=BTC.
      """
      _FUNCTION_KEY = "CURRENCY_EXCHANGE_RATE"
      return _FUNCTION_KEY, "Realtime Currency Exchange Rate", None
  
file_path: alpha_vantage/alpha_vantage/async_support/cryptocurrencies.py
imports: from .alphavantage import AlphaVantage
label_desc: Use image node_id 4 for calling the CryptoCurrencies obj's underlying member method code with example usage: obj.get_digital_currency_exchange_rate(from_currency, to_currency) and returns: _FUNCTION_KEY,  str,  None