Convert REST api to Websocket api or FIX api

Exercism
1 
   private static void fetchLotSizeStep(String apiKey) throws Exception {
        int retries = 3;
        while (retries > 0) {
            try {
                String endpoint = "https://api.binance.com/api/v3/exchangeInfo?symbol=" + SYMBOL;
                URL url = new URL(endpoint);
                HttpsURLConnection con = (HttpsURLConnection) url.openConnection();
                con.setRequestMethod("GET");
                con.setRequestProperty("X-MBX-APIKEY", apiKey);
                int responseCode = con.getResponseCode();
                if (responseCode == 200) {
                    BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
                    StringBuilder content = new StringBuilder();
                    String inputLine;
                    while ((inputLine = in.readLine()) != null) {
                        content.append(inputLine);
                    }
                    in.close();
                    JSONObject json = new JSONObject(content.toString());
                    JSONArray symbols = json.getJSONArray("symbols");
                    JSONObject symbolInfo = symbols.getJSONObject(0);
                    JSONArray filters = symbolInfo.getJSONArray("filters");
                    for (int i = 0; i < filters.length(); i++) {
                        JSONObject filter = filters.getJSONObject(i);
                        if (filter.getString("filterType").equals("LOT_SIZE")) {
                            lotSizeStep = filter.getDouble("stepSize");
                            break;
                        }
                    }
                    return;  // Successfully fetched data, exit method
                } else {
                    throw new RuntimeException("Error fetching LOT_SIZE step. HTTP error code: " + responseCode);
                }
            } catch (java.net.UnknownHostException e) {
                retries--;
                if (retries == 0) {
                    throw new RuntimeException("Network error: Unable to connect to Binance API after multiple attempts.", e);
                }
                Thread.sleep(1);  // Wait before retrying
            } catch (Exception e) {
                throw e;  // Other exceptions are not retried
            }
        }
    }

i need this to be using Websocket api or FIX api on binance, give me some help here or maybe a small code snippet or something like guiding every step of the way like for example just saying " first u import this and that" and stuff like this

2

Context: Using Websocket api or FIX api on binance for placing orders using JAVA

3

Find a tutorial to get started. A tutorial will give you guidance and steps to using WebSocket or FIX. Follow the steps in the tutorial. If you get stuck, you can ask for help with that step.

4

this is kinda energy draining, i’m sorry but this is the truth, i literally can’t get help from u for free, i dont have funds to pay, u wont cooperate with me cuz of some legal complications and i just steel feel stuck while ur telling me to find a tutorial myself when i come here to get these type of infos from u, could u pls help me like just as a human being who is just curios and wants to get that curiosity out in the world and make a good thing why couldn’t u just out of ur kind heart and good brain just please help

5

Thus says our overlord ChatGPT:

Converting this code to FIX API involves several considerations since FIX (Financial Information eXchange) is a protocol-based messaging standard, while the given code uses REST API for communication. FIX does not work with HTTP requests but instead sends and receives messages over TCP/IP.

The corresponding FIX implementation for fetching LOT_SIZE step size would involve:
1. Understanding the specific FIX tags needed for the desired operation.
2. Establishing a session with the FIX server.
3. Sending a request message with appropriate tags.
4. Parsing the response message to extract the LOT_SIZE or equivalent information.

Here is an example in pseudocode to illustrate a FIX API implementation:

FIX API Version (Pseudocode)

import quickfix.;
import quickfix.field.;
import quickfix.fix44.*;

public class FixClient {
private SessionID sessionID;

public FixClient(SessionID sessionID) {
    this.sessionID = sessionID;
}

public void fetchLotSizeStep() throws Exception {
    // Create a request message
    SecurityListRequest securityListRequest = new SecurityListRequest();
    securityListRequest.set(new SecurityReqID("1")); // Unique ID for the request
    securityListRequest.set(new SecurityRequestType(SecurityRequestType.SYMBOL));
    securityListRequest.set(new Symbol("SYMBOL")); // Replace with your symbol

    // Send the message
    Session.sendToTarget(securityListRequest, sessionID);

    // Handle response asynchronously in the onMessage method
}

// Handle incoming messages
public void onMessage(SecurityList message, SessionID sessionID) throws FieldNotFound {
    SecurityList.NoRelatedSym noRelatedSymGroup = new SecurityList.NoRelatedSym();
    while (message.hasGroup(noRelatedSymGroup)) {
        message.getGroup(noRelatedSymGroup);
        Symbol symbol = new Symbol();
        noRelatedSymGroup.get(symbol);
        
        // Fetch filters or equivalent
        if (symbol.getValue().equals("SYMBOL")) { // Match specific symbol
            Group filterGroup = new Group(146, 55, new int[]{130, 110});
            while (noRelatedSymGroup.hasGroup(filterGroup)) {
                filterGroup = noRelatedSymGroup.getGroup(filterGroup);
                // Extract LOT_SIZE or equivalent
                String filterType = filterGroup.getField(new StringField(130)).getValue();
                if ("LOT_SIZE".equals(filterType)) {
                    double stepSize = filterGroup.getField(new DoubleField(110)).getValue();
                    System.out.println("Lot size step: " + stepSize);
                    return;
                }
            }
        }
    }
}

}

Key Notes:
1. FIX Tags:
• SecurityReqID: A unique ID for your request.
• SecurityRequestType: Defines the type of request (e.g., fetch by symbol).
• Symbol: Specifies the trading symbol.
2. Session Management: Use a FIX engine like QuickFIX or similar to handle session management and messaging.
3. Event-Driven Response: FIX operates asynchronously. Responses arrive via callbacks like onMessage.
4. Testing Environment: Ensure the FIX gateway of the exchange (like Binance FIX API, if supported) is correctly configured.
5. Mapping Tags: The exact tags for “LOT_SIZE” and other parameters depend on the FIX specification provided by the exchange.

Since FIX implementations vary by exchange, you must consult the FIX documentation for the specific server you’re working with (e.g., Binance FIX documentation) to adjust the tags and flow accordingly.

I’d suggest asking ChatGPT for help. It’ll get you where you want to go the quickest.

6

woah is this the creator of this website speaking?

7

We do this via education via Exercism. We don’t just write projects for people for free. Please don’t ask us to write this for you.

If you want to learn how to write FIX, learn how to write FIX. If you get stuck and have a specific question, ask on a FIX forum.

1 Like
8

it is an honour sir. hi. i was wondering if u could help me sir, i am seriously stuck as u can already tell, and chatgpt isn’t exactly giving me what i want as it gives me a bunch of things that don’t work, it works well with REST api and all but not for Websocket and FIX api and i also dont have the paid version of chatgpt

9

If you’re building financial applications where 100ms is a key metric for you, you really need to invest time into properly learning this stuff. Hacking together things based on what strangers on the internet say isn’t going to be a good strategy for you. You’ll just lose money in the long run.

ChatGPT often isn’t good at giving code, but it is good at explaining things when we get stuck. So you need to slowly work through one step at a time with ChatGPT (or one of the other LLMs) to ask that.

Or, you need to ask on a forum specific to WebSockets or FIX.

These forums are to help people learning programming languages on Exercism and solving Exercism exercises - rather than just general programming support.

I wish you all the best, but you need a better approach to solve this :slight_smile:

1 Like
10

wait i dont know what strangers u are referring to sir, but could u like help me by getting a 20usd /month chatgpt subscription cuz that i think is my problem where i can’t get better access to the wide internet and better thinking and processing, i would really appreciate it if u helped me get it, i just need the account with the paid subscription not like any money straight up

11

also i mean i could literally miss out on this because i’m busy studying the whole basics of coding when i already made a trading code using REST api but like i said again, it is extremely slow and using FIX api or Websocket api specifically FIX api is the best option there is to get what i am asking for hopefully

12

No one is giving you a free subscription or writing code for you. That’s not how life works. If you’d like to have your code use FIX or WebSocket, you’re going to have to spend the time to learn how to use those technologies yourself. We can guide you and help you if you get stuck, but you are going to have to put in the work.

1 Like
13 
 private static void fetchLotSizeStep(String apiKey) throws Exception {
        int retries = 3;
        while (retries > 0) {
            try {
                String endpoint = "https://api.binance.com/api/v3/exchangeInfo?symbol=" + SYMBOL;
                URL url = new URL(endpoint);
                HttpsURLConnection con = (HttpsURLConnection) url.openConnection();
                con.setRequestMethod("GET");
                con.setRequestProperty("X-MBX-APIKEY", apiKey);
                int responseCode = con.getResponseCode();
                if (responseCode == 200) {
                    BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
                    StringBuilder content = new StringBuilder();
                    String inputLine;
                    while ((inputLine = in.readLine()) != null) {
                        content.append(inputLine);
                    }
                    in.close();
                    JSONObject json = new JSONObject(content.toString());
                    JSONArray symbols = json.getJSONArray("symbols");
                    JSONObject symbolInfo = symbols.getJSONObject(0);
                    JSONArray filters = symbolInfo.getJSONArray("filters");
                    for (int i = 0; i < filters.length(); i++) {
                        JSONObject filter = filters.getJSONObject(i);
                        if (filter.getString("filterType").equals("LOT_SIZE")) {
                            lotSizeStep = filter.getDouble("stepSize");
                            break;
                        }
                    }
                    return;  // Successfully fetched data, exit method
                } else {
                    throw new RuntimeException("Error fetching LOT_SIZE step. HTTP error code: " + responseCode);
                }
            } catch (java.net.UnknownHostException e) {
                retries--;
                if (retries == 0) {
                    throw new RuntimeException("Network error: Unable to connect to Binance API after multiple attempts.", e);
                }
                Thread.sleep(1);  // Wait before retrying
            } catch (Exception e) {
                throw e;  // Other exceptions are not retried
            }
        }
    }
```    this is my attempt to use FIX api to make this method work the same as it did while using the REST api or in short with the same functionality and i have errors here where it is not working, i think there is something wrong here but i dont know where so  pls help quickly
14

What sort of errors?

Expedited help costs extra :smile:

15

‘lookupSession(quickfix.SessionID)’ in ‘quickfix.Session’ cannot be applied to ‘(quickfix.SessionSettings)’
Cannot resolve symbol ‘FIXApplication’
Cannot resolve method ‘sendToTarget(SecurityDefinitionRequest, SessionSettings)’
Cannot resolve method ‘waitForResponse’ in ‘Application’
Cannot resolve method ‘getSecurityDefinition’ in ‘Application’
Cannot resolve method ‘size’ in ‘Group’
‘getFieldTag()’ in ‘quickfix.Group’ cannot be applied to ‘(int)’

16

It sounds like you are calling method which are not defined. Methods must be defined (or imported) before you can call them.