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Commission schemes with funding fees for crypto futures



  • Hi all,

    I read the docs about custom commission schemes and credit interest but not sure I understand it correctly.

    Some context: I'm trading on crypto exchange Binance on BTCUSDT futures market, my strategy use 4h data to compute long and short signal. Binance has a funding fee that has to be paid if a position is open at 0-8-16h00 and is approximatly 0.03% daily (0.01% per funding interval) + a premium (that I will ignore)

    "Binance uses a flat interest rate component, with the assumption that holding cash equivalent returns a higher interest than BTC equivalent. The difference is stipulated to be 0.03% per day by default (0.01% per funding interval since funding occurs every 8 hours)"

    import backtrader as bt
    
    class MyCommissionInfo(bt.CommInfo):
        def _get_credit_interest(self, size, price, days, dt0, dt1):
            '''
            This method returns  the cost in terms of credit interest charged by
            the broker.
    
            In the case of ``size > 0`` this method will only be called if the
            parameter to the class ``interest_long`` is ``True``
    
            The formulat for the calculation of the credit interest rate is:
    
              The formula: ``days * price * abs(size) * (interest / 365)``
    
    
            Params:
              - ``data``: data feed for which interest is charged
    
              - ``size``: current position size. > 0 for long positions and < 0 for
                short positions (this parameter will not be ``0``)
    
              - ``price``: current position price
    
              - ``days``: number of days elapsed since last credit calculation
                (this is (dt0 - dt1).days)
    
              - ``dt0``: (datetime.datetime) current datetime
    
              - ``dt1``: (datetime.datetime) datetime of previous calculation
    
            ``dt0`` and ``dt1`` are not used in the default implementation and are
            provided as extra input for overridden methods
            '''
    
        return days * abs(size) * price * (self.p.interest / 365.0)
    

    Not sure how to modify this to have what I want.

    Thanks for your help and let me know if more informations are needed!



  • I forgot to mention that there is also a trading fee for opening and closing a trade of 0.04%


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