code: def get_fiat_prices(self, base=None, symbol=None):
          
  
          data = {}
  
          if base is not None:
              data['base'] = base
          if symbol is not None:
              data['currencies'] = symbol
  
          return self._get('prices', False, data=data)
docs: Get fiat price for currency
  
          https://docs.kucoin.com/#get-fiat-price
  
          :param base: (optional) Fiat,eg.USD,EUR, default is USD.
          :type base: string
          :param symbol: (optional) Cryptocurrencies.For multiple cyrptocurrencies, please separate them with
                         comma one by one. default is all
          :type symbol: string
  
          .. code:: python
  
              prices = client.get_fiat_prices()
  
          :returns: ApiResponse
  
          .. code:: python
  
              {
                  "BTC": "3911.28000000",
                  "ETH": "144.55492453",
                  "LTC": "48.45888179",
                  "KCS": "0.45546856"
              }
  
          :raises: KucoinResponseException, KucoinAPIException