> ## Documentation Index
> Fetch the complete documentation index at: https://docs.qfex.com/llms.txt
> Use this file to discover all available pages before exploring further.

# 设置杠杆

可为账户中的各交易品种设置杠杆等级。

> [!NOTE]
>
> 存在未完成订单或非零持仓时，不能更改杠杆等级。

杠杆通过 **WebSocket** 管理。

* **接口：**`wss://trade.qfex.com?api_key=YOUR_API_KEY`。
* **连接后必须在 1 分钟内完成身份认证。**

## 请求示例

```json theme={null}
{
  "type": "set_user_leverage",
  "params": {
    "symbol": "AAPL-USD",
    "leverage": 20.0
  }
}
```

* `symbol`：要设置杠杆的交易品种。
* `leverage`：要设置的杠杆等级。

## 示例代码

```python python theme={null}
# 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..." }}})
    # Set leverage
    send(ws, {"type": "set_user_leverage", "params": {"symbol": "AAPL-USD", "leverage": 20.0}})

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()
```

```javascript node theme={null}
// Node.js (ws)
import WebSocket from "ws";
const ws = new WebSocket("wss://trade.qfex.com?api_key=YOUR_API_KEY");
const API_KEY = "YOUR_API_KEY";

ws.on("open", () => {
  ws.send(JSON.stringify({ type: "auth", params: { api_key: API_KEY } }));
  ws.send(
    JSON.stringify({
      type: "set_user_leverage",
      params: { symbol: "AAPL-USD", leverage: 20.0 },
    })
  );
});

ws.on("message", (msg) => console.log("Message:", msg.toString()));
```

```go go theme={null}
// Go (gorilla/websocket)
package main

import (
	"log"
	"github.com/gorilla/websocket"
)

func mustWriteJSON(c *websocket.Conn, v any) {
	if err := c.WriteJSON(v); err != nil { log.Fatal("write:", err) }
}

func main() {
	c, _, err := websocket.DefaultDialer.Dial("wss://trade.qfex.com?api_key=YOUR_API_KEY", nil)
	if err != nil { log.Fatal("dial:", err) }
	defer c.Close()

	// Authenticate
	mustWriteJSON(c, map[string]any{
		"type": "auth",
		"params": map[string]any{"hmac": map[string]any{"public_key": "qfex_pub_xxxxx", "nonce": "c0ffee...", "unix_ts": 1760545414, "signature": "5f2e..."}}
	})

	// Set leverage
	mustWriteJSON(c, map[string]any{
		"type": "set_user_leverage",
		"params": map[string]any{"symbol": "AAPL-USD", "leverage": 20.0},
	})
}
```

```java java theme={null}
// Java (OkHttp WebSocket)
import java.util.concurrent.TimeUnit;
import okhttp3.*;

public class GetUserTradesWs {
  public static void main(String[] args) {
    OkHttpClient client = new OkHttpClient.Builder()
        .pingInterval(20, TimeUnit.SECONDS).build();

    Request req = new Request.Builder()
        .url("wss://trade.qfex.com?api_key=YOUR_API_KEY").build();

    WebSocketListener li = new WebSocketListener() {
      @Override public void onOpen(WebSocket ws, Response r) {
        ws.send("{\"type\": \"auth\", \"params\": { \"hmac\": { \"public_key\": \"qfex_pub_xxxxx\", \"nonce\": \"c0ffee...\..\", \"unix_ts\": 1760545414, \"signature\": \"5f2e...\" }}}");
        ws.send("{\"type\":\"set_user_leverage\",\"params\":{\"symbol\":\"AAPL-USD\",\"leverage\":20.0}}");
      }
      @Override public void onMessage(WebSocket ws, String text) {
        System.out.println(text);
      }
    };

    client.newWebSocket(req, li);
    try { Thread.sleep(Long.MAX_VALUE); } catch (InterruptedException ignored) {}
  }
}
```

## 响应示例

```json theme={null}
{ "ack_response": true }
```


This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.