curl --request GET \
  --url https://openapi.fcontext.com/api/market-data/quote/capital_flow \
  --header 'x-api-key: <api-key>'

{
  "capitalFlow": [
    {
      "inflow": "<string>",
      "timestamp": "2023-11-07T05:31:56Z"
    }
  ]
}