Share New Research 
So I wrote these functions that I thought might be useful to someone, so I'm pasting them here.
They attempt to place a limit order first, and then on the next loop, if the limit order is outstanding, they will cancel the limti order and place a market order.
My idea was to try to avoid paying fees when trading on GDAX this way. In my back testing though, you actually loose more money in the lost profit, than you save in the fees. So it seems you are better off doing market orders always (my stratergy is based around day trading, so perhaps with a longer holding time these would work for you),
def GoLong(self, symbol, ratio):
# Make sure we can trade this
security = self.Securities[symbol]
if not security.IsTradable:
self.Debug("{} is not tradable.".format(symbol))
return
# Setup vars
orderQuantity = self.CalculateOrderQuantity(symbol, ratio)
limit = 1.001 # +0.1% Limit Order above current price
limitPrice = round( security.Price * d.Decimal(limit), 2 )
openOrders = self.Transactions.GetOpenOrders(symbol)
if(openOrders):
# Cancel all outstanding orders, then do a Market Order
self.Transactions.CancelOpenOrders(symbol)
self.SetHoldings(symbol, ratio)
self.Log('Going long, canceled all open orders, did a Market Order')
else:
# No open orders, try a limit order then
self.LimitOrder(symbol, orderQuantity, limitPrice)
self.Log( str(security.Price) )
self.Log('Going long. Placed a limit order at ' + str(limitPrice))
def CloseLong(self, symbol):
# Make sure we can trade this
security = self.Securities[symbol]
if not security.IsTradable:
self.Debug("{} is not tradable.".format(symbol))
return
# Setup vars
quantity = security.Holdings.Quantity
limit = 1.001 # +0.1% Limit Order below current price
limitPrice = round( security.Price / d.Decimal(limit), 2 )
openOrders = self.Transactions.GetOpenOrders(symbol)
if(openOrders):
# Liquidate (which also cancels all outstanding orders)
self.Liquidate(symbol)
self.Log('Closing long, liquidated')
else:
# Try a limit order
self.LimitOrder(symbol, -quantity, limitPrice)
self.Log( str(security.Price) )
self.Log('Closing long. Placed a limit order at ' + str(limitPrice))
Ronald Crandall
Thanks mate, saved me some time :). It probably nets you some loss since you don't check to see if the limit when through until the next GoLong call.
You could probably try (though not sure if its worth the time like you say with intra-day) experimenting with checking for % of loss and either continuing to update the limitorder until it fills or then doing the market order.
I doubt this works, more just psuedocodish.
if(openOrders): # Check open order if self.Securities[symbol].Price < round((self.Portfolio[symbol].HoldingsCost/self.Portfolio[self.target_crypto].Quantity),2)*.90: # try to update existing order if exists for symbol being bought if not cancel any open order try: self.getOpenOrders(symbol).updateOrderFields.Update(limitPrice) except: self.Transactions.CancelOpenOrders(symbol)Ronald Crandall
Actually, just realized looking back at this, your closing limit sell order is set to security price / 1.001. So you are trying to set a limit sell order below the current price. I'm not sure how that method is translated for GDAX, but I'm pretty sure GDAX wouldn't except that order. I changed it in my code to be like .999 so it trys set a limit sell order .1% above the current price, seems to work better in testing.
Patrick Verhoeven
I have an issue where I place a limit order for say 3 ETH and 2.99999 gets filled and then if I update the Limit price for 0.00001 it is less than the $10 minimum.
How would you address that?
Drew Baker
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