This ProBuilder script is designed to calculate and display the overnight fees for both long and short positions based on the last trading bar’s closing price. The fees are calculated considering the broker’s fee and the LIBOR rate.

DEFParam CalculateonLastBars = 1
//PositionSize = 1
//BrokerFee = 2.5
//Libor = 0.4728

LongFee = Round(((PositionSize * close) * (((BrokerFee/100) + (Libor/100))/365))*100)/100
ShortFee = Round(((PositionSize * close) * (((BrokerFee/100) - (Libor/100))/365))*100)/100

DRAWTEXT("Long Fee #LongFee#",BarIndex, 2 ,SansSerif,Bold,16)coloured(153,153,0)
DRAWTEXT("Short Fee #ShortFee#",BarIndex, 1 ,SansSerif,Bold,16)coloured(153,153,0)

return 3,0

This script includes several key components:

• DEFParam CalculateonLastBars = 1: This line sets the indicator to calculate only on the last bar.
• PositionSize, BrokerFee, and Libor: These commented lines are placeholders to set the position size, broker’s fee percentage, and the LIBOR rate, respectively. They need to be defined for the script to run properly.
• LongFee and ShortFee Calculations: These lines calculate the overnight fees for long and short positions. The formula takes the product of the position size and the closing price, adjusted by the sum (for long) or difference (for short) of the broker’s fee and LIBOR rate, divided by 365 days to get a daily rate, and rounded to two decimal places.
• DRAWTEXT Functions: These functions display the calculated fees on the chart. “Long Fee #LongFee#” and “Short Fee #ShortFee#” are displayed at specific bar indices with specified font attributes and colors.

This example serves as a practical application of using variables, arithmetic operations, and drawing functions in ProBuilder to create financial indicators.