code: def place_market_order(self,
                           side,
                           product_id='BTC-USD',
                           size=None,
                           funds=None,
                           client_oid=None,
                           stp=None):
      
      return self._place_order(type='market',
                               side=size,
                               product_id=product_id,
                               size=size,
                               funds=funds,
                               client_oid=client_oid,
                               stp=stp)
docs: `<https://docs.exchange.coinbase.com/#orders>`_