About the indicators
DIX Dark Index
DIX is the dollar-weighted average of dark-pool short-sale ratios for S&P 500 stocks. A short sale in a dark pool often comes from a dealer filling a customer's buy order, so a higher DIX can be a clue to buying that is otherwise hard to see.
It is a proxy for that activity, not a count of customer buys or a promise about the next market move.
The argument: Short is Long
GEX Gamma Exposure
GEX estimates how much option dealers may need to change their S&P 500 hedges when prices move. Positive GEX points to hedging that can lean against a move; negative GEX points to hedging that can push with it.
It is an estimate of possible pressure on volatility, not a forecast of market direction. The calculation depends on assumptions about who holds the options.
The model: Gamma Exposure
For definitions and current usage, see the Documentation.