Methodology

NityOI.com is about visualizing change in OI data for NSE tradeable index.

Nifty oi collects index option chain data every 15 min from nseindia website.
It filters collected data as below
1. Takes top 7 out of money call
2. Takes top 7 out of money puts
Then differece will be calculated for change in oi

Example :



sum of top 7 OTM Calls = 90063
sum of top 7 OTM Puts = 16758
then difference will be Put COI - Call COI = -73305

If difference is greater than 0 then we can conclude put writters are more active than call writter and index can be positive.
If it's less than 0 concludes call writters are active and index can be negative

niftyoi.com users can visualize the data using charts and tabular formats.
This data is available for Nifty , BankNifty and FinNifty