Not a REST call: this is the WebSocket handshake. Connect to the URL below and the exchange answers 101 Switching Protocols; everything after that is frames, not requests.

Public: no key, no signature.

Every futures trade on the pairs you name, as it prints.

{ "Method": "subscribe", "CurrencyPairs": ["BTCUSDT"] }

The server acknowledges with {"Result":"Subscribed"}. A data frame has the same shape as GET /api/futures/deals:

{
  "timestamp": "2026-09-21T09:15:42.117Z",
  "price": 64180.5,
  "amount": 0.012,
  "currencyPairCode": "BTCUSDT",
  "isLong": true,
  "orderSide": 0
}

This feed is anonymous: account, order, fee, PnL, leverage and copy-trading fields are never published. Futures pair codes have no underscore (BTCUSDT); discover them with GET /api/futures/exchange-data/pairs. /ping is shared with the spot channels.