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WebSocket APIs

 are a series of public (unauthenticated) feeds, that provide a real time stream of the available trading data (ticker, time and sales, order book, etc.) for our markets.

As live market data streams, any changes to the market data (such as updates to the best bid/ask prices or volumes, for example) would cause an update message to be sent via one or more of the market data feeds.

 has been established (using the public URL 

), the market data feeds can be subscribed to by sending a subscription message like the following:

Upon receipt of a valid subscription request, the market data feeds would send a subscription confirmation message:

followed by an initial market data snapshot (depending upon the feed in question), and then the live stream of the real time market data.

Example live stream from a market data feed

 feed, illustrating the type of messages that are received for various market data changes (such as trade occurring causing the best bid/ask volume to change):

[324,{"a":["42243.20000",3,"3.04172624"],"b":["42243.10000",0,"0.28500000"],"c":["42243.20000","0.00073657"],"v":["634.15053067","2117.90194729"],"p":["41908.86644","41673.47236"],"t":[7214,21130],"l":["40772.20000","40772.20000"],"h":["42474.30000","42571.50000"],"o":["41016.00000","41896.10000"]},"ticker","XBT/USD"]
{"event":"heartbeat"}
{"event":"heartbeat"}
{"event":"heartbeat"}
{"event":"heartbeat"}
[324,{"a":["42243.20000",0,"0.01460168"],"b":["42243.10000",3,"3.82293519"],"c":["42243.20000","0.01398000"],"v":["634.16451067","2117.88824812"],"p":["41908.87381","41673.47318"],"t":[7215,21126],"l":["40772.20000","40772.20000"],"h":["42474.30000","42571.50000"],"o":["41016.00000","41898.80000"]},"ticker","XBT/USD"]
{"event":"heartbeat"}
{"event":"heartbeat"}
{"event":"heartbeat"}
{"event":"heartbeat"}
{"event":"heartbeat"}
[324,{"a":["42255.00000",0,"0.08406816"],"b":["42243.10000",6,"6.33160603"],"c":["42255.00000","0.01593184"],"v":["634.19504419","2117.90471127"],"p":["41908.89020","41673.47996"],"t":[7217,21123],"l":["40772.20000","40772.20000"],"h":["42474.30000","42571.50000"],"o":["41016.00000","41908.00000"]},"ticker","XBT/USD"]
{"event":"heartbeat"}
{"event":"heartbeat"}
{"event":"heartbeat"}
{"event":"heartbeat"}
{"event":"heartbeat"}
[324,{"a":["42254.80000",0,"0.53200000"],"b":["42251.60000",0,"0.10000000"],"c":["42254.80000","0.05800000"],"v":["634.25304419","2117.94005439"],"p":["41908.92184","41673.49337"],"t":[7218,21122],"l":["40772.20000","40772.20000"],"h":["42474.30000","42571.50000"],"o":["41016.00000","41922.40000"]},"ticker","XBT/USD"]
{"event":"heartbeat"}
{"event":"heartbeat"}
{"event":"heartbeat"}
[324,{"a":["42248.60000",2,"2.84602281"],"b":["42247.00000",0,"0.12500000"],"c":["42248.60000","0.04168347"],"v":["634.29472766","2117.98132192"],"p":["41908.94416","41673.50464"],"t":[7219,21122],"l":["40772.20000","40772.20000"],"h":["42474.30000","42571.50000"],"o":["41016.00000","41922.40000"]},"ticker","XBT/USD"]
[324,{"a":["42248.60000",2,"2.83204281"],"b":["42246.90000",0,"0.10000000"],"c":["42248.60000","0.01398000"],"v":["634.30870766","2117.99530192"],"p":["41908.95164","41673.50844"],"t":[7220,21123],"l":["40772.20000","40772.20000"],"h":["42474.30000","42571.50000"],"o":["41016.00000","41922.40000"]},"ticker","XBT/USD"]
{"event":"heartbeat"}
{"event":"heartbeat"}

 messages are sent at a frequency of 1 per second when there is no ticker (or other market data) available.

Details of the individual fields/values within the JSON messages for the 

 feed (and all of the other market data feeds) are available in our 

WebSocket API v1 - Market data feed example

Quella che segue è una semplice implementazione Python per connettersi e iscriversi alle nostre feed dei dati pubblici di mercato dell'API WebSocket. Questo codice ti permette di connetterti all'API WebSocket, iscriverti ai canali pubblici e poi stampare i dati di mercato ricevuti nel tuo ambiente terminale.

Puoi scaricare l'implementazione Python a questo link: 

 (https://support.kraken.com/hc/article_attachments/360019365892/kraken_connection.py)

{"event": "ping"}{"event": "ping", "reqid":1012}

{ "event": "subscribe", "pair": ["ETH/USD"], "subscription": { "name": "spread" }}{ "event": "subscribe", "pair": ["XBT/USD"], "subscription": { "name": "spread" }, "reqid":1223}{ "event": "subscribe", "pair": ["XBT/EUR"], "subscription": { "name": "trade" }}{ "event": "subscribe", "pair": ["XBT/USD"], "subscription": { "name": "ohlc", "interval":5 }}{ "event": "subscribe", "pair": ["XRP/EUR"], "subscription": { "name": "book", "depth": 10 }}

{ "event": "unsubscribe", "channelID": 146 }{ "event": "unsubscribe", "pair": ["ETH/USD"], "subscription": { "name": "spread" }}{ "event": "unsubscribe", "pair": ["XBT/USD"], "subscription": { "name": "spread" }, "reqid": 1223 }

Per maggiori dettagli, fai riferimento alla documentazione dell'API WebSocket pubblica che può essere trovata qui: https://www.kraken.com/en-us/help/websocket-api (https://www.kraken.com/en-us/help/websocket-api)

Quella che segue è una semplice implementazione Python per connettersi e iscriversi alle nostre feed dei dati pubblici di mercato dell'API WebSocket. Questo codice ti permette di connetterti all'API WebSocket, iscriverti ai canali pubblici e poi stampare i dati di mercato ricevuti nel tuo ambiente terminale.Puoi scaricare l'implementazione Python a questo link: <a href="https://support.kraken.com/hc/article_attachments/360019365892/kraken_connection.py">kraken_connection.py</a>Connessione in terminale (node.js)Connessione all'API WebSocket pubblica:<pre>wscat -c wss://ws.kraken.com/</pre>Ottieni ping:<pre>{"event": "ping"} {"event": "ping", "reqid":1012}</pre>Iscriviti al canale:<pre>{ "event": "subscribe", "pair": ["ETH/USD"], "subscription": { "name": "spread" }} { "event": "subscribe", "pair": ["XBT/USD"], "subscription": { "name": "spread" }, "reqid":1223} { "event": "subscribe", "pair": ["XBT/EUR"], "subscription": { "name": "trade" }} { "event": "subscribe", "pair": ["XBT/USD"], "subscription": { "name": "ohlc", "interval":5 }} { "event": "subscribe", "pair": ["XRP/EUR"], "subscription": { "name": "book", "depth": 10 }} </pre>Annulla iscrizione al canale:<pre>{ "event": "unsubscribe", "channelID": 146 } { "event": "unsubscribe", "pair": ["ETH/USD"], "subscription": { "name": "spread" }} { "event": "unsubscribe", "pair": ["XBT/USD"], "subscription": { "name": "spread" }, "reqid": 1223 }</pre>Per maggiori dettagli, fai riferimento alla documentazione dell'API WebSocket pubblica che può essere trovata qui: <a href="https://www.kraken.com/en-us/help/websocket-api">https://www.kraken.com/en-us/help/websocket-api</a>

 Feed pubblici dell'API WebSocket - Esempi di Codice Python

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