Subscribe — Fills

# Python (websocket-client)
# pip install websocket-client
import json, websocket

API_KEY = "YOUR_API_KEY"

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

def on_open(ws):
    # 1) 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..." }}})
    # 2) Subscribe to fills
    send(ws, {"type": "subscribe", "params": {"channels": ["fills"]}})

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

// Node.js (ws)
// npm i ws
import WebSocket from "ws";

const API_KEY = "YOUR_API_KEY";
const ws = new WebSocket("wss://trade.qfex.com?api_key=YOUR_API_KEY");

ws.on("open", () => {
  ws.send(JSON.stringify({ type: "auth", params: { api_key: API_KEY } }));
  ws.send(
    JSON.stringify({
      type: "subscribe",
      params: { channels: ["fills"] },
    })
  );
});

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

// Go (gorilla/websocket)
// go get github.com/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()

	// 1) 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..."}}
	})

	// 2) Subscribe to fills
	mustWriteJSON(c, map[string]any{
		"type": "subscribe",
		"params": map[string]any{"channels": []string{"fills"}},
	})

	// Read messages (optional)
	for {
		_, data, err := c.ReadMessage()
		if err != nil { log.Fatal("read:", err) }
		log.Println(string(data))
	}
}

// Java (OkHttp WebSocket)
// Gradle: implementation("com.squareup.okhttp3:okhttp:4.12.0")
import java.util.concurrent.TimeUnit;
import okhttp3.*;

public class FillsSub {
  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\":\"subscribe\",\"params\":{\"channels\":[\"fills\"]}}");
      }
      @Override public void onMessage(WebSocket ws, String text) {
        System.out.println(text);
      }
      @Override public void onFailure(WebSocket ws, Throwable t, Response r) {
        System.err.println("WS error: " + t.getMessage());
      }
    };

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