I have downloaded historical data from the Upstox URL for a 15-minute time frame, and now I am trying to calculate the RSI value in Excel. After calculating the RSI value, I compared it with the RSI value displayed on the Upstox chart and found that they are different. I searched on YouTube and Google for the formula, and everything seems correct from my perspective, but the RSI value still does not match. Please help me understand how I can calculate the RSI to match the Upstox RSI value.
I have one suggestion for you. You are already providing Open, High, Low, Close, Volume, and OI through the Upstox API. Please improve your API to also provide RSI, EMA, SMA, Supertrend, and other indicator values that are commonly used by traders. This would be very helpful for traders and could attract more users, as no other broker provides indicator values for different time frames.