curl --request GET \
  --url https://api.ask.surf/gateway/v1/exchange/perp

{
  "data": {
    "exchange": "<string>",
    "funding": {
      "exchange": "<string>",
      "funding_rate": 123,
      "index_price": 123,
      "interval": "<string>",
      "mark_price": 123,
      "next_funding": "<string>",
      "pair": "<string>"
    },
    "open_interest": {
      "exchange": "<string>",
      "open_interest_amount": 123,
      "open_interest_usd": 123,
      "pair": "<string>",
      "timestamp": 123
    },
    "pair": "<string>"
  },
  "meta": {
    "cached": true,
    "credits_used": 123
  },
  "$schema": "<string>"
}