curl --request GET \
  --url https://api.perpetuals.polymarket.com/v1/info/index

{
  "asset": "NVDA",
  "index_price": "160.00",
  "constituents": [
    {
      "source": "chainlink",
      "symbol": "NVDA/USD",
      "weight": "1.0",
      "price": "160.00"
    }
  ],
  "ts": 1767225600000
}