# Gamma Exposure (GEX)

Dealer gamma exposure computed from an option chain and drawn on the chart in
MQL5.

Companion code for the MQL5 article: https://www.mql5.com/en/articles/23410

## What it does

Gamma exposure estimates how dealers have to hedge as spot moves. Where net
gamma is positive, hedging leans against price and dampens it. Where it is
negative, hedging pushes with price. The zero-gamma flip is the level between
the two, and it is the number most of this is built to find.

The Black-Scholes core prices options, inverts price to implied volatility, and
returns gamma. `GexData` aggregates the chain into a profile per strike, and
`GexMap.mq5` draws it beside the price axis.

The chain can come from a CSV or from native MetaTrader 5 options, so the tool
works whether or not your broker carries the instruments.

## Layout

```
Include/GEX/BlackScholes.mqh        pricing, IV inversion, greeks
Include/GEX/GexData.mqh             chain aggregation and the flip level
Include/GEX/GexProviderNative.mqh   native MT5 options feed
Indicators/GEX/GexMap.mq5           the chart map
Files/GEX/gex_chain_sample.csv      sample chain, for running without a feed
```

The sample CSV lets you run the indicator before wiring up a live chain.

## Disclaimer

Educational code. Past behaviour of any model or dataset says nothing about
future results. Test on your own data and broker conditions before drawing
conclusions.