Gamma Exposure (GEX) API

Endpoint

curl -H "X-Api-Key: YOUR_API_KEY" \
  "https://lab.flashalpha.com/v1/exposure/gex/SPY"

import requests

resp = requests.get(
    "https://lab.flashalpha.com/v1/exposure/gex/SPY",
    headers={"X-Api-Key": "YOUR_API_KEY"}
)
data = resp.json()
print(f"Net GEX: ${data['net_gex']:,.0f}")
print(f"Gamma Flip: {data['gamma_flip']}")

const resp = await fetch(
  "https://lab.flashalpha.com/v1/exposure/gex/SPY",
  { headers: { "X-Api-Key": "YOUR_API_KEY" } }
);
const data = await resp.json();
console.log(`Net GEX: $${data.net_gex.toLocaleString()}`);
console.log(`Gamma Flip: ${data.gamma_flip}`);

Response

{
  "symbol": "SPY",
  "underlying_price": 597.505,
  "as_of": "2026-02-28T16:30:45Z",
  "gamma_flip": 595.25,
  "net_gex": 2850000000,
  "net_gex_label": "positive",
  "strikes": [
    {
      "strike": 575.0,
      "call_gex": 12500000,
      "put_gex": 8900000,
      "net_gex": 21400000,
      "call_oi": 15000,
      "put_oi": 12000,
      "call_volume": 250,
      "put_volume": 180,
      "call_oi_change": 500,
      "put_oi_change": -200
    }
  ]
}

Key Response Fields

Errors

Plans & Rate Limits

What Is Gamma Exposure?

Gamma exposure (GEX) measures the dollar amount of shares that options dealers must buy or sell to delta-hedge for every 1% move in the underlying price. When dealers are long gamma (positive GEX), they buy dips and sell rallies - dampening volatility and creating mean-reverting, range-bound markets. When dealers are short gamma (negative GEX), their hedging amplifies moves - leading to trending, volatile price action. The gamma flip point marks where net exposure switches sign, often acting as a key pivot level.

Common Use Cases

• Locate the gamma flip - the gamma_flip spot where net dealer gamma crosses zero and the volatility regime changes; fade extensions above it, respect momentum below
• Map dealer walls - the largest positive-GEX strikes act as magnets and intraday support/resistance that absorb price moves
• Read the regime from net_gex - positive means dampened and range-bound, negative means amplified and trending; gate strategy selection on the sign
• Anticipate expiration pinning - heavy GEX concentration at an ATM strike into expiry pins price; confirm against max pain and pin risk
• Size and stop with GEX magnitude - larger absolute net GEX implies tighter dealer hedging and smaller realized ranges; calibrate stop distances accordingly
• Track the flip intraday - watch the flip migrate versus spot to catch the moment dealers switch from dampening to amplifying moves

Related

Related reading

• How to read a GEX-by-strike chart - turn the per-strike array into walls, the flip, and a regime read
• Complete guide to trading gamma exposure - the end-to-end GEX playbook from levels to execution
• Real-time GEX by strike: SPY key levels - a worked example reading dealer levels on SPY

Complementary endpoints

• Delta Exposure (DEX) - directional dealer positioning alongside gamma
• Vanna Exposure (VEX) - how dealer gamma shifts as implied vol moves
• Charm Exposure (CHEX) - how positioning decays as expiry approaches
• Key Levels - gamma flip, call wall, put wall, and max pain in one call