GEX Term Structure

curl https://api.gammaflip.io/api/v1/gex/term-oi/all/BTC \
  -H "X-API-Key: gex_sk_your_key_here"

import requests

resp = requests.get(
    "https://api.gammaflip.io/api/v1/gex/term-oi/all/BTC",
    headers={"X-API-Key": "gex_sk_your_key_here"},
)
data = resp.json()["data"]

for exp in data["expirations"]:
    t = exp["total"]
    print(
        f"{exp['date']} (d={exp['days_to_expiry']:>3}): "
        f"OI=${t['oi_usd']:>14,.0f}  "
        f"net GEX={t['total_gex']:+14,.0f}"
    )

const resp = await fetch(
  "https://api.gammaflip.io/api/v1/gex/term-oi/all/BTC",
  { headers: { "X-API-Key": "gex_sk_your_key_here" } }
);
const { data } = await resp.json();

for (const exp of data.expirations) {
  const t = exp.total;
  console.log(
    `${exp.date} (d=${exp.days_to_expiry}): ` +
    `OI=$${t.oi_usd.toFixed(0)}, net GEX=${t.total_gex.toFixed(0)}`
  );
}

{
  "data": {
    "expirations": [
      {
        "date": "15APR26",
        "days_to_expiry": 0,
        "timestamp": "2026-04-15T00:00:00+00:00",
        "exchanges": {
          "deribit": {
            "oi_usd": 252323000,
            "call_oi_usd": 115940056,
            "put_oi_usd": 136382943,
            "contracts": 104,
            "total_gex": -2481405,
            "abs_gex": 23314299,
            "upside_gex": 8007918,
            "downside_gex": 15306380
          }
        },
        "total": {
          "oi_usd": 252323000,
          "call_oi_usd": 115940056,
          "put_oi_usd": 136382943,
          "contracts": 104,
          "total_gex": -2481405,
          "abs_gex": 23314299,
          "upside_gex": 8007918,
          "downside_gex": 15306380
        }
      }
    ],
    "metadata": {
      "basecoin": "BTC",
      "exchanges_used": ["deribit"],
      "current_price": 74037.30,
      "expiration_count": 11
    }
  },
  "meta": {
    "timestamp": "2026-04-14T10:00:00+00:00",
    "exchange": "all",
    "coin": "BTC",
    "rate_limit": {
      "limit": 500,
      "remaining": 494,
      "reset": "2026-04-15T00:00:00+00:00"
    }
  }
}

GET

gex

term-oi

{exchange}

{coin}

curl https://api.gammaflip.io/api/v1/gex/term-oi/all/BTC \
  -H "X-API-Key: gex_sk_your_key_here"

import requests

resp = requests.get(
    "https://api.gammaflip.io/api/v1/gex/term-oi/all/BTC",
    headers={"X-API-Key": "gex_sk_your_key_here"},
)
data = resp.json()["data"]

for exp in data["expirations"]:
    t = exp["total"]
    print(
        f"{exp['date']} (d={exp['days_to_expiry']:>3}): "
        f"OI=${t['oi_usd']:>14,.0f}  "
        f"net GEX={t['total_gex']:+14,.0f}"
    )

const resp = await fetch(
  "https://api.gammaflip.io/api/v1/gex/term-oi/all/BTC",
  { headers: { "X-API-Key": "gex_sk_your_key_here" } }
);
const { data } = await resp.json();

for (const exp of data.expirations) {
  const t = exp.total;
  console.log(
    `${exp.date} (d=${exp.days_to_expiry}): ` +
    `OI=$${t.oi_usd.toFixed(0)}, net GEX=${t.total_gex.toFixed(0)}`
  );
}

{
  "data": {
    "expirations": [
      {
        "date": "15APR26",
        "days_to_expiry": 0,
        "timestamp": "2026-04-15T00:00:00+00:00",
        "exchanges": {
          "deribit": {
            "oi_usd": 252323000,
            "call_oi_usd": 115940056,
            "put_oi_usd": 136382943,
            "contracts": 104,
            "total_gex": -2481405,
            "abs_gex": 23314299,
            "upside_gex": 8007918,
            "downside_gex": 15306380
          }
        },
        "total": {
          "oi_usd": 252323000,
          "call_oi_usd": 115940056,
          "put_oi_usd": 136382943,
          "contracts": 104,
          "total_gex": -2481405,
          "abs_gex": 23314299,
          "upside_gex": 8007918,
          "downside_gex": 15306380
        }
      }
    ],
    "metadata": {
      "basecoin": "BTC",
      "exchanges_used": ["deribit"],
      "current_price": 74037.30,
      "expiration_count": 11
    }
  },
  "meta": {
    "timestamp": "2026-04-14T10:00:00+00:00",
    "exchange": "all",
    "coin": "BTC",
    "rate_limit": {
      "limit": 500,
      "remaining": 494,
      "reset": "2026-04-15T00:00:00+00:00"
    }
  }
}

What it returns

For each non-expired expiration, this endpoint returns:

Open Interest in USD (calls, puts, and total) per exchange
Gamma Exposure (total, upside, downside, absolute) per exchange
Contract count per exchange
Aggregated totals across all requested exchanges
Per-expiration metadata — date, days to expiry, timestamp

Use this to understand how gamma and OI are distributed across the term structure, and to spot the expirations where dealer positioning is heaviest.

Path parameters

exchange

string

required

Exchange name: bybit, deribit, okx, or all (cross-exchange aggregation).

coin

string

required

Base coin symbol (uppercase).

Response shape

{
  "data": {
    "expirations": [
      {
        "date": "15APR26",
        "days_to_expiry": 0,
        "timestamp": "2026-04-15T00:00:00+00:00",
        "exchanges": {
          "deribit": {
            "oi_usd": 252323000.06,
            "call_oi_usd": 115940056.62,
            "put_oi_usd": 136382943.44,
            "contracts": 104,
            "total_gex": -2481405.91,
            "abs_gex": 23314299.33,
            "upside_gex": 8007918.34,
            "downside_gex": 15306380.99
          }
        },
        "total": {
          "oi_usd": 252323000.06,
          "call_oi_usd": 115940056.62,
          "put_oi_usd": 136382943.44,
          "contracts": 104,
          "total_gex": -2481405.91,
          "abs_gex": 23314299.33,
          "upside_gex": 8007918.34,
          "downside_gex": 15306380.99
        }
      }
    ],
    "metadata": {
      "basecoin": "BTC",
      "exchanges_used": ["deribit"],
      "current_price": 74037.30,
      "expiration_count": 11,
      "timestamp": "2026-04-14T22:43:30.035178+00:00",
      "timestamp_ms": 1776206610035
    }
  }
}

Per-expiration field guide

Each entry in exchanges.* and total contains the same metric set:

Field	Meaning
`oi_usd`	Total open interest, USD notional
`call_oi_usd`	Open interest contributed by call options, USD
`put_oi_usd`	Open interest contributed by put options, USD
`contracts`	Number of option contracts (not USD)
`total_gex`	Net dealer gamma exposure (calls – puts), USD per 1% move
`abs_gex`	Absolute GEX magnitude — `	call_gex	+	put_gex	`
`upside_gex`	GEX concentrated above spot
`downside_gex`	GEX concentrated below spot

total holds the aggregate across all exchanges included in the response. When querying a single exchange (e.g. deribit), exchanges.deribit and total are identical.

Errors

400 invalid_exchange

error

Exchange name not recognized.

404 no_data

error

No data available for this coin/exchange combination.

curl https://api.gammaflip.io/api/v1/gex/term-oi/all/BTC \
  -H "X-API-Key: gex_sk_your_key_here"

import requests

resp = requests.get(
    "https://api.gammaflip.io/api/v1/gex/term-oi/all/BTC",
    headers={"X-API-Key": "gex_sk_your_key_here"},
)
data = resp.json()["data"]

for exp in data["expirations"]:
    t = exp["total"]
    print(
        f"{exp['date']} (d={exp['days_to_expiry']:>3}): "
        f"OI=${t['oi_usd']:>14,.0f}  "
        f"net GEX={t['total_gex']:+14,.0f}"
    )

const resp = await fetch(
  "https://api.gammaflip.io/api/v1/gex/term-oi/all/BTC",
  { headers: { "X-API-Key": "gex_sk_your_key_here" } }
);
const { data } = await resp.json();

for (const exp of data.expirations) {
  const t = exp.total;
  console.log(
    `${exp.date} (d=${exp.days_to_expiry}): ` +
    `OI=$${t.oi_usd.toFixed(0)}, net GEX=${t.total_gex.toFixed(0)}`
  );
}

{
  "data": {
    "expirations": [
      {
        "date": "15APR26",
        "days_to_expiry": 0,
        "timestamp": "2026-04-15T00:00:00+00:00",
        "exchanges": {
          "deribit": {
            "oi_usd": 252323000,
            "call_oi_usd": 115940056,
            "put_oi_usd": 136382943,
            "contracts": 104,
            "total_gex": -2481405,
            "abs_gex": 23314299,
            "upside_gex": 8007918,
            "downside_gex": 15306380
          }
        },
        "total": {
          "oi_usd": 252323000,
          "call_oi_usd": 115940056,
          "put_oi_usd": 136382943,
          "contracts": 104,
          "total_gex": -2481405,
          "abs_gex": 23314299,
          "upside_gex": 8007918,
          "downside_gex": 15306380
        }
      }
    ],
    "metadata": {
      "basecoin": "BTC",
      "exchanges_used": ["deribit"],
      "current_price": 74037.30,
      "expiration_count": 11
    }
  },
  "meta": {
    "timestamp": "2026-04-14T10:00:00+00:00",
    "exchange": "all",
    "coin": "BTC",
    "rate_limit": {
      "limit": 500,
      "remaining": 494,
      "reset": "2026-04-15T00:00:00+00:00"
    }
  }
}

List Expirations GEX by Strike (Enhanced)

Endpoints

Discovery

Data

What it returns

Path parameters

Response shape

Per-expiration field guide

Errors

​What it returns

​Path parameters

​Response shape

​Per-expiration field guide

​Errors

What it returns

Path parameters

Response shape

Per-expiration field guide

Errors