Can market be crypto too?

[Dorien]

The alpha vantage documentation says that for currency exchanges both can be a crypto. However, I get an error when market is crypto:
data, meta_data = cc.get_digital_currency_daily(symbol='BTC', market='ETH')

/usr/local/lib/python3.6/dist-packages/alpha_vantage/alphavantage.py in _handle_api_call(self, url)
    335                     'Error getting data from the api, no return was given.')
    336             elif "Error Message" in json_response:
--> 337                 raise ValueError(json_response["Error Message"])
    338             elif "Information" in json_response and self.treat_info_as_error:
    339                 raise ValueError(json_response["Information"])

ValueError: Invalid API call. Please retry or visit the documentation (https://www.alphavantage.co/documentation/) for DIGITAL_CURRENCY_DAILY.

Documentation from https://www.alphavantage.co/documentation/:

❚ Required: function

The function of your choice. In this case, function=CURRENCY_EXCHANGE_RATE

❚ Required: 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