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

import requests

resp = requests.get(
    "https://api.gammaflip.io/api/v1/expirations/all/BTC",
    headers={"X-API-Key": "gex_sk_your_key_here"},
)
for exp in resp.json()["data"]["expirations"]:
    print(exp)

{
  "data": {
    "expirations": [
      "18APR26",
      "25APR26",
      "02MAY26",
      "09MAY26",
      "27JUN26",
      "26SEP26"
    ]
  },
  "meta": {
    "timestamp": "2026-04-14T10:00:00+00:00",
    "exchange": "all",
    "coin": "BTC",
    "rate_limit": {
      "limit": 500,
      "remaining": 497,
      "reset": "2026-04-15T00:00:00+00:00"
    }
  }
}

{
  "error": "invalid_exchange",
  "message": "Exchange 'kraken' is not available."
}