How to Read Gamma Exposure: Bitcoin GEX Live Case Study

BTC is trading at $77,140. The May 22 options expiry is 16 hours away. And $51 million in put open interest is stacked on a single strike while the gamma regime reads NEGATIVE. Let's walk through exactly what you're looking at on Cayø Largo's GEX Landscape page, chart by chart and what each one tells you about what happens next.

The Setup

It is May 21, 2026, BTC sits at $77,140 and the May 22 Deribit expiry is 16 hours out. Options expire all the time and the gamma profile on this one tells a story worth reading.

The magnetic strike sits at $76,000, about 1.5% below spot. The Pin Score reads 63 out of 100 and the magnet quality is B, meaning vol-stable but fast-decaying. And fast it is: the half-life is just 1.8 hours, which means the pinning force loses half its remaining strength every 108 minutes. The gamma regime is NEGATIVE, with the GEX Flip at $78,148, about 1.3% above the current price.

If those numbers mean nothing yet, that is the point of this article. We walk through each chart on the GEX Landscape page in order and by the end you will read them like a weather forecast.

Gamma Exposure by Strike

This is the first chart you see and every bar is one strike price. Blue bars extending right mean positive gamma, which stabilises and orange bars extending left mean negative gamma, which amplifies.

Two strikes jump off the screen. The $76,000 magnetic strike shows -$8.0M of negative GEX and $77,000 right above it adds another -$6.4M, with everything below $78,000 orange. The only blue bars sit at $78,500 (+$1.3M) and $80,000 (+$1.7M), both above the GEX Flip.

What does "negative gamma" actually mean in practice? When someone buys a put on Deribit a market maker usually sells it to them and to stay risk-neutral that market maker hedges by selling some BTC, adjusting as the price moves. Gamma measures how fast they need to adjust and the sign tells you whether their hedging stabilises or destabilises the market.

The formula for gamma exposure at a single strike:

$$\text{GEX}_k = \Gamma_k \times \text{OI}_k \times \text{contract\_size} \times S^2 \times 0.01$$

where $\Gamma_k$ is gamma at strike $k$, $\text{OI}_k$ is open interest in contracts, $\text{contract\_size}$ is the Deribit multiplier (1 for BTC) and $S$ is spot. Net GEX at a strike sums call gamma exposure and subtracts put gamma exposure. When that net is negative, dealer hedging amplifies moves: price drops trigger more selling, price rises trigger more buying. The shock absorbers are off.

The GEX Flip at $78,148 is the price where cumulative gamma crosses zero and BTC trades $1,000 below it. That is negative gamma territory, where every move gets amplified by dealer hedging rather than dampened.

This is not our reading alone. Derive Insights published a similar analysis on May 20, aggregating GEX across all expiries and five exchanges (Deribit, Derive, Binance, Bybit, OKX). Their conclusion: the largest negative bar sits at $76K, positive GEX only begins at $79K and the $80K-$81K call wall is the ceiling. Our single-expiry Deribit view confirms the same structure at higher resolution. Here's a side-by-side comparison:

Signal	Derive Insights (all expiries, 5 exchanges)	Cayø Largo (May 22 expiry, Deribit)
Largest negative bar	$76K	$76,000 at -$8.0M (magnetic strike)
Deep negative territory	Below $78,500	Everything below $78,000
Amplifying zone	$77,500-$78,500 amplified the move	$77,000 at -$6.4M, GEX Flip at $78,148
Positive GEX begins	$79K+	$78,500 (+$1.3M)
Call wall / ceiling	$80K-$81K dominant wall	$80,000 at +$1.7M
Resistance	$77,500, failed to reclaim	Upper breakout $77,500 EXTREME

What Changes When You Correct for Taker Flow

Here is where most analytics platforms stop. Standard GEX assumes every option was bought by a customer and sold by a dealer and that assumption is wrong in 55 to 60% of cases.

Cayø Largo reads the actual trade tape from Deribit to determine who was the buyer and who was the seller in each transaction. The result on this expiry is dramatic.

The $76,000 strike flips from -$8.0M in the standard view to +$8.2M in the corrected one, a complete sign reversal and $77,000 flips from -$6.4M to +$6.4M. Below spot, nearly every strike turns blue. The real negative weight has shifted: $78,000 now reads -$16.1M, more than double any single bar in the standard chart.

This changes the trading narrative entirely. Standard GEX tells you the magnet at $76,000 is destabilising. Corrected GEX tells you it's actually stabilising: dealers are providing a floor there, not amplifying a breakdown. The real danger zone is $78,000, one thousand dollars above spot, where the corrected chart reveals the deepest amplifying pocket in this entire expiry.

Open Interest: Follow the Money

The next chart shows where the capital is actually sitting and it helps to think of open interest as the raw material the GEX profile is built from.

The two heaviest positions frame a wide battlefield. Call open interest at $80,000 reaches $89.1M, the single largest position on the board. Put open interest at $74,000 counters with $76.9M. Between these poles, the magnetic strike at $76,000 holds $51.4M in puts and $78,000 has $38.5M in puts against $36.0M in calls, making it the most contested strike on the chain.

Max pain sits at $78,500, about 1.8% above spot. That gap tells you where open interest is stacked relative to the current price and nothing more. Read it as a description of the chain rather than a target: measured across 919 Deribit expiries, max pain loses to simply assuming price stays put on every coin. The levels worth acting on here are the gamma ones below.

Gamma Evolution: Watching the Fuse Burn

This chart adds the dimension standard GEX snapshots miss: time.

The chart tracks three strikes over time. The $76,000 magnetic strike (white line) has been oscillating between -$5M and -$10M, recently spiking deeper before recovering. The $77,000 strike (orange) runs steadier around -$3M to -$4M. The $80,000 strike (blue) is the only positive line, sitting between +$1M and +$2M.

The dotted lines projecting from "NOW" toward expiry are the key feature. These are calculated from Surface Charm, one of Cayø Largo's proprietary strike-surface Greeks:

$$\text{Surface Charm} = -\frac{\partial^2 V}{\partial K \, \partial t}$$

Surface Charm measures how the option's sensitivity to strike price (dual delta, $\partial V / \partial K$) changes as time passes toward expiration. This is different from standard Charm (which tracks how delta decays over time). Surface Charm tells you how fast the pricing structure at a specific strike flattens as expiry approaches: when it flattens, the magnetic pull at that strike fades. The projected half-life follows from it directly:

$$\text{half\text{-}life} = \frac{0.5 \times |\text{net\_gamma\_oi}|}{|\text{net\_surface\_charm\_oi}| + \epsilon}$$

The half-life here is 1.8 hours. That means 50% decay by approximately 17:28 UTC on May 21, which is just 11% of the remaining 16-hour window. The dotted decay paths show all three strikes converging toward zero as expiry approaches: the structural force dissolves and the price becomes free to move.

Breakout Zone: Where the Price Goes Next

The final chart ties everything together.

The upper breakout sits at $77,500 and the lower one at $75,500, both labelled EXTREME and both showing "IV fading: wall holds", meaning implied volatility at those strikes is declining rather than rising. Nobody is paying up for a breakout in either direction. For now.

That is a $2,000 band. Look at the price history across the chart: BTC dropped sharply to around $73,000 on May 19, recovered and has oscillated inside the pinning zone ever since, with the magnetic strike at $76,000 holding through multiple tests. Max pain at $78,500 (red dotted line) sits above the entire zone, which says the chain is stacked above spot. It is not a magnet and that claim does not survive measurement.

But the 1.8-hour half-life means the structure is dissolving fast and each passing hour weakens the pin. The closer the May 22 expiry comes, the more likely a directional break becomes. And in a negative gamma regime, dealer hedging will amplify whatever direction the break takes.

What You Just Learned for Free

Five charts, one story. BTC is pinned near $76,000 with a $2,000 breakout corridor closing from both sides and the gamma regime is negative, so any breakout gets amplified. The pinning force has a 1.8-hour half-life, the fastest decay in this article. Standard GEX says the magnet is destabilising. Taker-flow correction tells a different story: the $76,000 strike is actually providing a floor, while $78,000 hides the real amplifying pocket at -$16.1M.

This is the kind of nuance that changes a trading decision. Without the correction you might short the breakdown through $76,000 and with it you would recognise the stabilising cushion and look elsewhere.

This is one expiry, one coin, one snapshot. But it shows exactly what gamma exposure analysis gives you: not a prediction but a map of the forces acting on price. Once you understand the mechanics, every expiry becomes a story you can follow in real time.

Every chart in this article comes from Cayø Largo's GEX Landscape page. It updates every 10 minutes, for every coin we cover, completely free. No login, no paywall. Just open it and start reading.