curl --request GET \
  --url https://api.hypereth.io/v1/aster/fapi/v1/premiumIndex \
  --header 'X-MBX-APIKEY: <api-key>'

{
  "symbol": "<string>",
  "markPrice": "<string>",
  "indexPrice": "<string>",
  "estimatedSettlePrice": "<string>",
  "lastFundingRate": "<string>",
  "nextFundingTime": 123,
  "interestRate": "<string>",
  "time": 123
}