Gamma Flip
Canonical definition, formula, interpretation rules, and live API reference for the gamma flip level.
The price level where aggregate dealer gamma exposure crosses zero — the boundary between positive gamma (mean-reversion) and negative gamma (amplification) regimes. Many traders use it as the primary intraday pivot.
Interpolated from the per-strike GEX curve. The sum is across all strikes in the option chain, with call gamma positive and put gamma negative. The zero crossing is found by interpolation between adjacent strikes where the sign changes.
- Above the flip: positive gamma regime. Dealers buy dips, sell rips. Mean-reverting, range-bound conditions.
- Below the flip: negative gamma regime. Dealers sell dips, buy rips. Trending, amplified volatility.
- At the flip: regime transition point. Maximum uncertainty — the market is on the knife edge between dampening and amplification.
Live Example: SPY
Live SPY gamma flip data temporarily unavailable. See /stock/spy/gamma for current values.
Get Gamma Flip via API
symbol(path, required) — underlying ticker, e.g.SPY
{
"symbol": "SPY",
"underlying_price": number,
"gamma_flip": number,
"call_wall": number,
"call_wall_gex": number,
"put_wall": number,
"put_wall_gex": number,
"net_gex": number,
"net_gex_label": "positive" | "negative"
}curl -H "X-Api-Key: YOUR_KEY" \
https://lab.flashalpha.com/v1/exposure/levels/SPYWhy Gamma Flip Matters for Trading
The gamma flip is the single most important intraday level in options flow. Above it: mean-reversion. Below it: trending.
- What it measures
- The strike at which net dealer gamma crosses zero — the boundary between positive and negative gamma regimes.
- What it signals
- Where dealer hedging behaviour changes sign. Spot relative to the flip defines which playbook runs.
- Why we measure it
- Regime change is where most vol shocks start. The flip is the exact level that change happens — worth watching like a hawk on index ETFs.
- Who uses it
- Discretionary day traders, 0DTE specialists, systematic flow traders, and anyone running a regime-filter strategy.
How to read Gamma Flip
- Positive gamma regime active
- Mean-reversion dominates
- Ranges hold, walls defended
- Premium-selling strategies work
- Negative gamma regime active
- Trending, amplified moves
- Walls break, vol expands
- Long-vol / momentum strategies work
- Regime in transition
- Whippy, two-way price action
- Size down until direction resolves
- Cleanest breakout setups post-resolution
Rules of thumb
- Level matters more than proximity. A break of the flip is a regime change event — treat it like a trend change.
- Flip shifts with OI. The flip moves intraday as new option volume prints. Refresh frequently on active days.
- Watch it on index ETFs. SPY/QQQ flips are broadly-followed. Single-stock flips are noisier and less regime-setting.
- Confirm with realised vol change. Regime flips show up in RV with a 1-3 session lag — use as post-hoc confirmation.
- Pair with call wall / put wall. Flip + walls = complete intraday map: flip is the regime pivot, walls are the boundaries within the regime.
How to Read the Gamma Flip
The gamma flip is the single most important intraday pivot derived from the options market. Start by comparing spot price to the flip level. Above the flip, dealers are net long gamma across the chain. Their hedging activity dampens volatility — they buy as price dips and sell as price rallies. This creates a mean-reverting regime where range-bound strategies, credit spreads, and iron condors tend to outperform.
Below the flip, the dynamic inverts. Dealers are net short gamma and their hedging amplifies moves — they sell as price falls and buy as price rises. This creates a trending regime where breakout strategies and momentum trades tend to work, while mean-reversion gets hurt.
The crossing itself is the most important event. When price breaks below the gamma flip, expect a volatility expansion and wider ranges. When price reclaims the flip from below, expect volatility compression and tightening ranges. Many discretionary traders use the gamma flip as their primary trend filter — long bias above, short bias below — and combine it with the call wall (resistance) and put wall (support) to frame the expected range.
Related Concepts
Net dealer gamma exposure — the underlying force whose zero crossing defines the gamma flip.
The strike with the highest call gamma concentration — acts as intraday resistance in positive-gamma regimes.
The strike with the highest put gamma concentration — acts as intraday support in positive-gamma regimes.
The strike where total option holder loss is minimized at expiration — often converges with the gamma flip near expiry.
The directional sibling of GEX — net delta dealers must hedge across the chain.
Learn More
Complete guide to options-derived levels with dealer mechanics and trading applications.
Full endpoint reference with parameters, response schema, and tier limits.
Gamma flip, call wall, and put wall visualisation for any US equity or ETF.
The net dealer gamma exposure whose zero crossing defines the gamma flip.
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