code: def buy_limit(self, market, quantity, rate):
          
          return self._api_query(path_dict={
              API_V1_1: '/market/buylimit',
          }, options={'market': market,
                      'quantity': quantity,
                      'rate': rate}, protection=PROTECTION_PRV)
docs: Used to place a buy order in a specific market. Use buylimit to place
          limit orders Make sure you have the proper permissions set on your
          API keys for this call to work
  
          Endpoint:
          1.1 /market/buylimit
          2.0 NO Direct equivalent.  Use trade_buy for LIMIT and MARKET buys
  
          :param market: String literal for the market (ex: BTC-LTC)
          :type market: str
          :param quantity: The amount to purchase
          :type quantity: float
          :param rate: The rate at which to place the order.
              This is not needed for market orders
          :type rate: float
          :return:
          :rtype : dict