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Ethereum: Binance SpotWebsocket Client Not Sending Responses to Subscribed Symbol

As a cryptocurrency trader, getting real-time updates from a reliable source is crucial to making informed decisions. One such source is the Binance Spot WebSocket API, which provides a way to connect to the Ethereum blockchain and receive real-time market data. However, there is an issue when using the BinanceSpotWebsocketClient library that may prevent it from sending responses to subscribed symbols.

Issue: Unregistered Subscription

In your code snippet, you create a new instance of the SpotWebsocketClient class and pass in the subscription details. However, when you subscribe to a specific symbol using the subscribe method, you don’t have to explicitly unsubscribe from it afterwards. If this happens, the client will continue to send data for that symbol even if you remove yourself from the list.

Solution: Using the «unsubscribe» method

To resolve this issue, you should always call the «unsubscribe» method when you unsubscribe. Here is an updated version of your code with this fix:

import json file
import datetime
from websocket
def safe_json_load(data):
return data
def safe_json_dump(data):
return json dumps (data)
class BinanceSpotWebsocketClient:
def __init__(self, symbol, secretKey, apiEndpoint):
self.symbol = symbol
self . secret = secret
self
self.subscriptions = {}
def subscribe(self, symbol, callback=None):
if symbol is not in self subscription:
self subscription [ symbol ] = None
response = safe_json_load(callback);
if response is None:
raise ValueError("Invalid subscription");
self _subscribe (symbol, response)
def unsubscribe ( self , symbol ):
if symbol is not in self subscription:
return
self.subscriptions[symbol]









Call the callback function to raise the unsubscribed event
if symbol in self.callbackFunctions:
self.callbackFunctions[symbol]()
def _subscribe(self, symbol, data):

This method is called when a subscription is created
print(f"Subscribed to {symbol} for real-time updates")
def sendRealtimeData(self, symbol):

This method can be used to get real-time data for a specific symbol
pass

Usage example:
client = BinanceSpotWebsocketClient(
"ETH", 
Symbol
"YOUR_SECRET_KEY", 
secret key
" 
endpoint API
)
def onRealtimeDataReceived(data):
print(f"{data['symbol']} updated to {data['newPrice']}")
client.subscribe("ETH", onRealtimeDataReceived)

Testing the Code

You can test this code by running it in a Jupyter notebook. Make sure you have the binance library installed, and also make sure you replace "YOUR_SECRET_KEY" with your actual Binance secret key.

Once you have created an instance of BinanceSpotWebsocketClient, you can subscribe to a specific symbol using the subscribe method, which will trigger real-time data updates for that symbol. You can then unsubscribe by calling the unsubscribe method when you are ready to stop receiving updates.

Following these steps, you should be able to troubleshoot your code and ensure that it is sending responses to subscribed symbols.