How to connect to poloniex.com websocket api using a python library

Question

I am trying to connect to wss://api.poloniex.com and subscribe to ticker. I can\'t find any working example in python. I have tried to use autobahn/twisted and websocket-cli

Answer 1

This uses the undocumented websocket endpoint because Poloniex has pulled support for the original WAMP socket endpoint.

import websocket
import thread
import time
import json

def on_message(ws, message):
    print(message)

def on_error(ws, error):
    print(error)

def on_close(ws):
    print("### closed ###")

def on_open(ws):
    print("ONOPEN")
    def run(*args):
        ws.send(json.dumps({'command':'subscribe','channel':1001}))
        ws.send(json.dumps({'command':'subscribe','channel':1002}))
        ws.send(json.dumps({'command':'subscribe','channel':1003}))
        ws.send(json.dumps({'command':'subscribe','channel':'BTC_XMR'}))
        while True:
            time.sleep(1)
        ws.close()
        print("thread terminating...")
    thread.start_new_thread(run, ())


if __name__ == "__main__":
    websocket.enableTrace(True)
    ws = websocket.WebSocketApp("wss://api2.poloniex.com/",
                              on_message = on_message,
                              on_error = on_error,
                              on_close = on_close)
    ws.on_open = on_open
    ws.run_forever()

The channels are:

1001 = trollbox (you will get nothing but a heartbeat)
1002 = ticker
1003 = base coin 24h volume stats
1010 = heartbeat
'MARKET_PAIR' = market order books

Answer 2

Meanwhile poloniex changed the ticker API, so now it returns a symbol-id instead of a name, so maybe someone will find this useful:

7: BTC_BCN
8: BTC_BELA
10: BTC_BLK
12: BTC_BTCD
13: BTC_BTM
14: BTC_BTS
15: BTC_BURST
20: BTC_CLAM
24: BTC_DASH
25: BTC_DGB
27: BTC_DOGE
28: BTC_EMC2
31: BTC_FLDC
32: BTC_FLO
38: BTC_GAME
40: BTC_GRC
43: BTC_HUC
50: BTC_LTC
51: BTC_MAID
58: BTC_OMNI
61: BTC_NAV
63: BTC_NEOS
64: BTC_NMC
69: BTC_NXT
73: BTC_PINK
74: BTC_POT
75: BTC_PPC
83: BTC_RIC
89: BTC_STR
92: BTC_SYS
97: BTC_VIA
98: BTC_XVC
99: BTC_VRC
100: BTC_VTC
104: BTC_XBC
108: BTC_XCP
112: BTC_XEM
114: BTC_XMR
116: BTC_XPM
117: BTC_XRP
121: USDT_BTC
122: USDT_DASH
123: USDT_LTC
124: USDT_NXT
125: USDT_STR
126: USDT_XMR
127: USDT_XRP
129: XMR_BCN
130: XMR_BLK
131: XMR_BTCD
132: XMR_DASH
137: XMR_LTC
138: XMR_MAID
140: XMR_NXT
148: BTC_ETH
149: USDT_ETH
150: BTC_SC
151: BTC_BCY
153: BTC_EXP
155: BTC_FCT
158: BTC_RADS
160: BTC_AMP
162: BTC_DCR
163: BTC_LSK
166: ETH_LSK
167: BTC_LBC
168: BTC_STEEM
169: ETH_STEEM
170: BTC_SBD
171: BTC_ETC
172: ETH_ETC
173: USDT_ETC
174: BTC_REP
175: USDT_REP
176: ETH_REP
177: BTC_ARDR
178: BTC_ZEC
179: ETH_ZEC
180: USDT_ZEC
181: XMR_ZEC
182: BTC_STRAT
183: BTC_NXC
184: BTC_PASC
185: BTC_GNT
186: ETH_GNT
187: BTC_GNO
188: ETH_GNO
189: BTC_BCH
190: ETH_BCH
191: USDT_BCH
192: BTC_ZRX
193: ETH_ZRX
194: BTC_CVC
195: ETH_CVC
196: BTC_OMG
197: ETH_OMG
198: BTC_GAS
199: ETH_GAS
200: BTC_STORJ

Answer 3

Currently, Twisted doesn't properly use the Windows trust store. So the verification of the TLS certificate will fail. To work around this until either Twisted or Autobahn includes a workaround, you can:

• install certifi module (pip install certifi)
• set SSL_CERT_FILE, like export SSL_CERT_FILE="$(python -m certifi)"

Answer 4

What you are trying to accomplish can be done by using WAMP, specifically by using the WAMP modules of the autobahn library (that you are already trying to use).

After following their docs, I managed to set-up a simple example using autobahn and asyncio. The following example subscribes to the 'ticker' feed and prints the received values:

from autobahn.asyncio.wamp import ApplicationSession
from autobahn.asyncio.wamp import ApplicationRunner
from asyncio import coroutine


class PoloniexComponent(ApplicationSession):
    def onConnect(self):
        self.join(self.config.realm)

    @coroutine
    def onJoin(self, details):
        def onTicker(*args):
            print("Ticker event received:", args)

        try:
            yield from self.subscribe(onTicker, 'ticker')
        except Exception as e:
            print("Could not subscribe to topic:", e)


def main():
    runner = ApplicationRunner("wss://api.poloniex.com:443", "realm1")
    runner.run(PoloniexComponent)


if __name__ == "__main__":
    main()

You can find more details about WAMP programming with autobahn here: http://autobahn.ws/python/wamp/programming.html