curl --request GET \
  --url https://api.hayinsights.com/openapi/v1/etf/top-netflow \
  --header 'X-API-Key: <api-key>'

{
  "success": true,
  "statusCode": 200,
  "data": [
    {
      "etfCode": "1348",
      "etfName": "MAXIS TOPIX ETF",
      "netflow": 21323272800,
      "netflowAumPercentage": 0.47
    },
    {
      "etfCode": "518A",
      "etfName": "NEXT FUNDS FTSE Japan ex-REITs High Income Cash Flow 50 Index Exchange Traded Fund",
      "netflow": 4755004000,
      "netflowAumPercentage": 74.79
    }
  ],
  "meta": {
    "timestamp": "2026-06-19T08:50:39.000Z"
  }
}