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Stop Orders can be cancelled over WebSocket.
  • You must specify the stop_order’s stop_order_id (UUID v4).

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1) Authenticate

Send this immediately after you connect: 
{ "type": "auth", "params": { "hmac": { "public_key": "qfex_pub_xxxxx", "nonce": "c0ffee...", "unix_ts": 1760545414, "signature": "5f2e..." } } }

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2) Cancel Order

{
  "type": "cancel_stop_order",
  "params": {
    "stop_order_id": "510333ac-3f7b-4d88-934a-4396d48824cc"
  }
}

​
Parameters

FieldTypeRequiredDescription
stop_order_idstring✅UUID v4 of the stop order to cancel.

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Sample Code

# Python (websocket-client)
import json, websocket

API_KEY = "YOUR_API_KEY"

def send(ws, obj): ws.send(json.dumps(obj))

def on_open(ws):
    # Authenticate
    # https://docs.qfex.com/websocket/channels/trade/authenticate#how-it-works
    send(ws, {"type": "auth", "params": { "hmac": { "public_key": "qfex_pub_xxxxx", "nonce": "c0ffee...", "unix_ts": 1760545414, "signature": "5f2e..." }}})
    # Cancel stop order
    send(ws, {
        "type": "cancel_stop_order",
        "params": {
            "stop_order_id": "510333ac-3f7b-4d88-934a-4396d48824cc"
        }
    })

ws = websocket.WebSocketApp(
    "wss://trade.qfex.com?api_key=YOUR_API_KEY",
    on_open=on_open,
    on_message=lambda _, m: print("Message:", m)
)
ws.run_forever()

​
Example Response

When a stop order is successfully cancelled, you receive an order_response with status CANCELLED: 
{
  "order_response": {
    "order_id": "510333ac-3f7b-4d88-934a-4396d48824cc",
    "symbol": "AAPL-USD",
    "status": "CANCELLED",
    "quantity": 0.0,
    "price": 200.0,
    "side": "BUY",
    "type": "TAKE_PROFIT",
    "time_in_force": "GTC",
    "user_id": "0020ce8e-eaee-480e-8d7f-b9241d756ee5",
    "client_order_id": "",
    "quantity_remaining": 0.0
  }
}