WebSocket Streams

Connection Timeout

- The server closes the WebSocket connection after 60 seconds of inactivity (Connection Keep-Alive)

- Inactivity is defined as the absence of requests sent by the client

Connection Keep-Alive

To keep the WebSocket connection active, you need to

- Send periodic requests every 50 seconds

- Properly handle potential disconnections in your application's logic

Authorization

Introduction

Before signing any WebSocket requests, you must create an API key in your Cryptomus personal account

Detailed instructions for creating an API key are available here

Obtaining a One-Time Token for Connection

Before connecting to the WebSocket server, you need to obtain a one-time authentication token

You can obtain the token by sending the corresponding request

The token is valid for 5 minutes or until the first successful connection

Connecting to the WebSocket Server

To connect to the WebSocket server

1. Obtain a one-time authentication token

2. Specify the token in the query parameter token when establishing the connection

Connection URL example: wss://api-ws.cryptomus.com/ws?token=b0b1cacd26993392ecf072155bd1686c96e380ad12cefa564aa6665c85c77334

The token can only be used once. For each new connection, you need to request a new token

After successful token verification, the connection will be established, and you can subscribe to available channels

Obtaining a One-Time Authentication Token for WebSocket Connection

Allows generating a one-time authentication token for connecting to the WebSocket server. The token is valid until the first successful connection or until it expires (5 minutes).

GET

/v2/user-api/exchange/account/web-socket/token

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Authorization Headers

Full information about the required authorization headers is available here

Response

{ "token": "168b34a3a12370740ff1654f0d0c4726ff1bba8c4675edc0d7553f15e5a2a094" }

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Possible codes

200: The order was successfully created

404: User or resource not found

500: Internal server error

Symbols of the depth scale

Request

GET

https://exchange-ws.cryptomus.com/api/v2/symbol-scales?symbol={symbol}

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Response


1{
2  "status": "success",
3  "message": "success",
4  "data": [
5    {
6      "scale": "0.01",
7      "index": 0 // index
8    },
9    ...
10  ]
11}

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Market list

Request

GET

https://api-app.cryptomus.com/v1/exchange/market

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Response


1{
2  "result": [
3    {
4      "id": "01HSBPVS17CT2GN2FV34K3AMP9",
5      "symbol": "BTC_USDT",
6      "baseCurrency": "BTC",
7      "quoteCurrency": "USDT",
8      "baseMinSize": "0.0000100000000000",
9      "quoteMinSize": "0.1000000000000000",
10      "baseMaxSize": "10000000000.0000000000000000",
11      "quoteMaxSize": "99999999.0000000000000000",
12      "basePrec": "8",
13      "quotePrec": "6",
14      "baseCurrencyFullName": "Bitcoin",
15      "quoteCurrencyFullName": "Tether USD"
16    },
17    ...
18  ]
19}

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Example Implementation

Node.js


1const WebSocket = require('ws');
2
3class CryptomusWebSocket {
4    constructor(token) {
5        this.token = token;
6        this.socket = new WebSocket('wss://api-ws.cryptomus.com/ws?token=${this.token}');
7        this.setupConnection();
8    }
9
10    setupConnection() {
11        this.socket.on('open', () => {
12            console.log('Connected to Cryptomus WebSocket');
13            this.startPing();
14        });
15
16        this.socket.on('message', (data) => {
17            console.log('Received:', data.toString());
18        });
19    }
20
21    ping() {
22        if (this.socket.readyState === WebSocket.OPEN) {
23            this.socket.send(JSON.stringify({
24                id: 0,
25                method: "ping",
26                params: []
27            }));
28        }
29    }
30
31    startPing() {
32        setInterval(() => {
33            this.ping();
34        }, 50 * 1000); // Every 50 seconds
35    }
36}
37
38// Usage
39const token = "your_auth_token_here";
40const client = new CryptomusWebSocket(token);
41

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Python


1import asyncio
2import websockets
3import json
4
5class CryptomusWebSocket:
6    def __init__(self, token):
7        self.token = token
8        self.socket = None
9    
10    async def connect(self):
11        self.socket = await websockets.connect(f"wss://api-ws.cryptomus.com/ws?token={self.token}")
12        print('Connected to Cryptomus WebSocket')
13    
14    async def ping(self):
15        await self.socket.send(json.dumps({
16            "id": 0,
17            "method": "ping",
18            "params": []
19        }))
20    
21    async def start_ping(self):
22        while True:
23            await asyncio.sleep(50)  # Every 50 seconds
24            await self.ping()
25    
26    async def listen(self):
27        async for message in self.socket:
28            print(f"Received: {message}")
29    
30    async def run(self):
31        await self.connect()
32        
33        # Start ping task
34        ping_task = asyncio.create_task(self.start_ping())
35        
36        # Listen for messages
37        await self.listen()
38
39# Usage
40token = "your_auth_token_here"
41client = CryptomusWebSocket(token)
42asyncio.run(client.run())
43

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All endpoints return time in the Unix timestamp format

Request Message Structure

Name	Parameter type	Definition
id	Integer	Should be unique to process the response to your request
method	String	The request name
params	Array	Pass the parameters for the method here

Parameter type

Integer

Definition

Should be unique to process the response to your request

Parameter type

String

Definition

The request name

Parameter type

Array

Definition

Pass the parameters for the method here

The WebSocket connection will be terminated if invalid JSON is sent

Message and request types

- Request (`ping`, `candles_request`, etc.)

- Subscription (`candles_subscribe`, `lastprice_subscribe`, etc.). Resubscribing to the same data type will be canceled.

Response Message

Name	Parameter type	Definition
id	Integer	Request identifier
data	Null	if the request failed. If successful, the response structure for each method is shown below
error	Null	if successful. If there's an error
message	String
code	Integer	Error code

Parameter type

Integer

Definition

Request identifier

Parameter type

Null

Definition

if the request failed. If successful, the response structure for each method is shown below

Parameter type

Null

Definition

if successful. If there's an error

Parameter type

Integer

Definition

Error code

Code: 1. Message: Invalid message format

Code: 2. Message: Other errors

Response Message Types

- Query result

- Subscription status (success/failure)

- Update events

Ping/Pong

Ping


1{    
2  "id": 0,   
3  "method": "ping",   
4  "params": []
5} 
6

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Response pong


1{
2  "id": 0,
3  "method": "pong",
4  "data": null,
5  "error": null
6}         
7

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Examples subscriptions

Request


1{    
2  "id": 0,    
3  "method": "trade_subscribe",    
4  "params": [  
5      "BTC_USDT"    
6  ]
7}            
8

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Response


1{    
2  "id": 0,    
3  "method": "trade_subscribe",  
4  "data": {       
5	  "status": "success"    
6  },    
7  "error": null  
8} 
9

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Update Event


1{    
2  "id": 0,    
3  "method": "trade_update",    
4  "data": [], // See structure for each method below  
5  "error": null
6}  
7

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Last price

Subscription


1{   
2  "id": 0,   
3  "method": "lastprice_subscribe",   
4  "params": [   
5    "BTC_USDT",  // Market
6    "BTC_USDT",       
7    "ETH_USDT",      
8    ...    
9  ]
10}       
11

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Subscribe to all events lastprice_subscribe


1{    
2  "id": 0,   
3  "method": "lastprice_subscribe",   
4  "params": [  
5    "all" // This also works for other events    
6  ]
7}
8

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Response


1{    
2  "id": 0,    
3  "method": "lastprice_subscribe",  
4  "data": {       
5    "status": "success"    
6  },    
7  "error": null  
8}   
9

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Event


1{
2  "id": 0,
3  "method": "lastprice_update",
4  "data": {
5    "symbol": "BTC_USDT",
6    "timestamp": 1750953362,
7    "price": "107152.55"
8  },
9  "error": null
10}
11

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Subscription Cancellation

Request


1{    
2  "id": 0,   
3  "method": "lastprice_unsubscribe",   
4  "params": [  
5    "BTC_USDT",       
6    "ETH_USDT",       
7    ...    
8  ]
9}             
10

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Unsubscribe from all events lastprice_unsubscribe


1{    
2  "id": 0,   
3  "method": "lastprice_unsubscribe",   
4  "params": [  
5    "all" // This also works for other events   
6  ]
7}  
8

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Response


1{    
2  "id": 0,    
3  "data": {      
4    "status": "success"    
5  },    
6  "error": null  
7}

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Depth

Subscription

First you need to get the scale index of the market how to get


1{   
2  "id": 0,   
3  "method": "depth_subscribe",   
4  "params": [   
5    "BTC_USDT:0",  // market:scale_index 
6    "BTC_USDT:1",       
7    "ETH_USDT:1",       
8    ...    
9  ]
10}  
11

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Subscribe to all events depth_subscribe


1{    
2  "id": 0,   
3  "method": "depth_subscribe",   
4  "params": [  
5    "all" // This also works for other events    
6  ]
7}  
8

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Response


1{    
2  "id": 0,    
3  "method": "depth_subscribe",  
4  "data": {       
5    "status": "success"    
6  },    
7  "error": null  
8} 
9

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Event


1{
2  "id": 0,
3  "method": "depth_update",
4  "data": {
5    "symbol": "BTC_USDT",
6    "timestamp": 1750952911,
7    "full_reload": false, // If false, it is a partial update, if true, it is a fully updated orderbook.
8    "scale_index": 0,
9    "asks": [
10      [
11        "107043.93", // price
12        "0.304313" // value
13      ]
14    ],
15    "bids": [
16      [
17        "106976.11",
18        "0" // for partial update - finished orders will be 0
19      ]
20    ]
21  },
22  "error": null
23} 
24

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Subscription Cancellation

Request


1{    
2  "id": 0,   
3  "method": "depth_unsubscribe",   
4  "params": [  
5    "BTC_USDT:0", // market:scale_index     
6    "ETH_USDT:1",      
7    ...    
8  ]
9}  
10

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Unsubscribe from all events depth_unsubscribe


1{    
2  "id": 0,   
3  "method": "depth_unsubscribe",   
4  "params": [  
5    "all" // This also works for other events    
6  ]
7}  
8

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Response


1{    
2  "id": 0,    
3  "data": {      
4    "status": "success"    
5  },    
6  "error": null  
7}  
8

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Ticker

Subscription


1{   
2  "id": 0,   
3  "method": "ticker_subscribe",   
4  "params": [   
5    "BTC_USDT",  // Market
6    "BTC_USDT",       
7    "ETH_USDT",      
8    ...    
9  ]
10}  
11

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Subscribe to all events ticker_subscribe


1{    
2  "id": 0,   
3  "method": "ticker_subscribe",   
4  "params": [  
5    "all" // This also works for other events    
6  ]
7} 
8

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Response


1{    
2  "id": 0,    
3  "method": "ticker_subscribe",  
4  "data": {       
5    "status": "success"    
6  },    
7  "error": null  
8}  
9

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Event


1{
2  "id": 0,
3  "method": "ticker_update",
4  "data": {
5    "symbol": "BTC_USDT",
6    "timestamp": 1750953144,
7    "price": "107090.35",
8    "open": "107042.21",
9    "high": "108248.15",
10    "low": "106573.19",
11    "volume": "1531.027982",
12    "quote_volume": "164564314.80174687",
13    "price_change": "0.04"
14  },
15  "error": null
16} 
17

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Subscription Cancellation

Request


1{    
2  "id": 0,   
3  "method": "ticker_unsubscribe",   
4  "params": [  
5    "BTC_USDT",      // Market 
6    "ETH_USDT",       
7    ...    
8  ]
9} 
10

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Unsubscribe from all events ticker_unsubscribe


1{    
2  "id": 0,   
3  "method": "ticker_unsubscribe",   
4  "params": [  
5    "all" // This also works for other events    
6  ]
7} 
8

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Response


1{    
2  "id": 0,    
3  "data": {      
4    "status": "success"    
5  },    
6  "error": null  
7}  
8

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Trades

Subscription


1{   
2  "id": 0,   
3  "method": "trade_subscribe",   
4  "params": [   
5    "BTC_USDT",  // Market
6    "BTC_USDT",       
7    "ETH_USDT",      
8    ...    
9  ]
10}  
11

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Subscribe to all events trade_subscribe


1{    
2  "id": 0,   
3  "method": "trade_subscribe",   
4  "params": [  
5    "all" // This also works for other events    
6  ]
7}  
8

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Response


1{    
2  "id": 0,    
3  "method": "trade_subscribe",  
4  "data": {       
5    "status": "success"    
6  },    
7  "error": null  
8}  
9

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Event


1{
2  "id": 0,
3  "method": "trade_update",
4  "data": {
5    "symbol": "BTC_USDT",
6    "timestamp": 1750953177,
7    "trades": [
8      {
9        "price": 107100.01,
10        "quantity": 0.000254,
11        "timestamp": 1750953177,
12        "direction": "buy"
13      },
14      ...
15    ]
16  },
17  "error": null
18}
19

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Subscription Cancellation

Request


1{    
2  "id": 0,   
3  "method": "trade_unsubscribe",   
4  "params": [  
5    "BTC_USDT",    // Market   
6    "ETH_USDT",       
7    ...    
8  ]
9}  
10

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Unsubscribe from all events trade_unsubscribe


1{    
2  "id": 0,   
3  "method": "trade_unsubscribe",   
4  "params": [  
5    "all" // This also works for other events    
6  ]
7}  
8

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Response


1{    
2  "id": 0,    
3  "data": {      
4    "status": "success"    
5  },    
6  "error": null  
7}  
8

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Orders

Subscription


1{   
2  "id": 0,   
3  "method": "order_subscribe",   
4  "params": [   
5    "BTC_USDT",  // Market
6    "TRX_USDT",       
7    "ETH_USDT",       
8    ...    
9  ]
10}  
11

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Subscribe to all events order_subscribe


1{    
2  "id": 0,  
3  "method": "order_subscribe",    
4  "params": [      
5    "all" // This also works for other events    
6  ]
7}  
8

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Response


1{    
2  "id": 0,    
3  "method": "order_subscribe",  
4  "data": {      
5    "status": "success"    
6  },    
7  "error": null 
8} 
9

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Events

Order created


1{
2  "id": "1",
3  "method": "order_update",
4  "data": {
5    "type": "created",
6    "info": {
7      "id": "01JYET5DQ772MPYHHE417FQF1J",
8      "symbol": "TRX_USDT",
9      "orderType": "limit",
10      "direction": "sell",
11      "price": "0.2200000000000000",
12      "quantity": "50.0000000000000000",
13      "value": "11.0000000000000000",
14      "filledQuantity": "0.0000000000000000",
15      "filledValue": "0.0000000000000000",
16      "clientOid": null,
17      "createTs": 1750696376
18    }
19  },    
20  "error": null 
21}
22

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Order updated


1{
2  "id": "3",
3  "method": "order_update",
4  "data": {
5    "type": "updated",
6    "info": {
7      "id": "01JYET5DQ772MPYHHE417FQF1J",
8      "symbol": "TRX_USDT",
9      "orderType": "limit",
10      "direction": "sell",
11      "price": "0.2200000000000000",
12      "quantity": "50.0000000000000000",
13      "value": "11.0000000000000000",
14      "filledQuantity": "20.0000000000000000",
15      "filledValue": "4.4000000000000000",
16      "clientOid": null,
17      "createTs": 1750696376,
18      "updateTs": 1750696487,
19    }
20  },    
21  "error": null 
22}
23

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Order finished


1{
2  "id": "3",
3  "method": "order_update",
4  "data": {
5    "type": "finished",
6    "info": {
7      "id": "01JYET5DQ772MPYHHE417FQF1J",
8      "symbol": "TRX_USDT",
9      "orderType": "limit",
10      "direction": "sell",
11      "price": "0.2200000000000000",
12      "quantity": "50.0000000000000000",
13      "value": "11.0000000000000000",
14      "filledQuantity": "50.0000000000000000",
15      "filledValue": "11.0000000000000000",
16      "clientOid": null,
17      "createTs": 1750696376,
18      "finishTs": 1750696417,
19      "state": "completed""internalState": "filled"
20    }
21  },    
22  "error": null 
23}
24

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Unsubscribe from updates

From specific markets


1{    
2  "id": 0,   
3  "method": "order_unsubscribe",   
4  "params": [  
5    "BTC_USDT",   // Market    
6    "ETH_USDT",       
7    ...    
8  ]
9} 
10

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From all markets


1{    
2  "id": 0,   
3  "method": "order_unsubscribe",   
4  "params": [  
5    "all" // Optional, will also work if an empty array is passed in    
6  ]
7}  
8

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Response


1{    
2  "id": 0,    
3  "data": {      
4    "status": "success"    
5  },    
6  "error": null   
7} 
8

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Balances

Subscription

BaseCurrency from market-list


1{   
2  "id": 0,   
3  "method": "balance_subscribe",   
4  "params": [   
5    "BTC",  // BaseCurrency from market list
6    "TRX,      
7    "ETH",       
8    ...    
9  ]
10}  
11

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Subscribe to all events balance_subscribe


1{    
2  "id": 0,  
3  "method": "balance_subscribe",    
4  "params": [       
5    "all" // This also works for other events    
6  ]
7}  
8

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Response


1{    
2  "id": 0,    
3  "method": "balance_subscribe",  
4  "data": {      
5    "status": "success"    
6  },    
7  "error": null   
8}  
9

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Events


1{
2  "id": "4",
3  "method": "balance_update",
4  "data": {
5    "info": {
6      "walletId": "01J7E836F6K5KCX5DP2W0F6FAG",
7      "currencyCode": "USDT",
8      "amount": "50.0000000000000000",
9      "oldBalance": "40000.0000000000000000",
10      "newBalance": "39950.00000000"
11    }
12  },    
13  "error": null 
14}
15

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Unsubscribe from events

From specific currencies

BaseCurrency from market-list


1{    
2  "id": 0,   
3  "method": "balance_unsubscribe",   
4  "params": [  
5    "BTC",       // BaseCurrency from market list
6    "ETH",       
7    ...    
8  ]
9}     
10

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From all currencies


1{    
2  "id": 0,   
3  "method": "balance_unsubscribe",   
4  "params": [  
5    "all" // Optional, will also work if an empty array is passed in    
6  ]
7}   
8

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Response


1{    
2  "id": 0,    
3  "data": {      
4    "status": "success"    
5  },    
6  "error": null   
7}  
8

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Deals

Subscription


1{   
2  "id": 0,   
3  "method": "deal_subscribe",   
4  "params": [   
5    "BTC_USDT",   // Market
6    "TRX_USDT,       
7    "ETH_USDT",       
8    ...   
9  ]
10} 
11

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Subscribe to all events deal_subscribe


1{    
2  "id": 0,  
3  "method": "deal_subscribe",    
4  "params": [       
5    "all" // This also works for other events    
6  ]
7}  
8

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Response


1{    
2  "id": 0,    
3  "data": {      
4    "status": "success"    
5  },    
6  "error": null  
7}
8

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Events


1{
2  "id": "4",
3  "method": "deal_update",
4  "data": {
5    "info": {
6      "dealId": "01JYH50V5VWPP3QTYGM6CPZ0AR",
7      "symbol": "TRX_USDT",
8      "dealState": "completed",
9      "transactionId": "01JYH50V5YM8M3943KJ9HY2VXM",
10      "filledPrice": "0.2726960000000000",
11      "filledQuantity": "100.0000000000000000",
12      "filledValue": "27.2696000000000000",
13      "fee": "1.0907840000000000",
14      "feeCurrency": "USDT",
15      "tradeRole": "taker",
16      "committedAt": 1750774869
17    }
18  },    
19  "error": null 
20}
21

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Unsubscribe from updates

From specific markets


1{    
2  "id": 0,   
3  "method": "deal_unsubscribe",   
4  "params": [  
5    "BTC_USDT",   // Market
6    "TRX_USDT,       
7    ...    
8  ]
9} 
10

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From all markets


1{    
2  "id": 0,   
3  "method": "deal_unsubscribe",   
4  "params": [  
5    "all" // Optional, will also work if an empty array is passed in    
6  ]
7} 
8

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Response


1{    
2  "id": 0,    
3  "data": {      
4    "status": "success"    
5  },    
6  "error": null   
7} 
8

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