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+Title: Websocket from Kraken in Valutakrambod
+Tags: english, bitcoin
+Date: 2019-02-01 22:25
+
+<p>Yesterday, the Kraken virtual currency exchange announced
+<a href="https://blog.kraken.com/post/2019/websockets-public-api-launching-soon/">their
+Websocket service</a>, providing a stream of exchange updates to its
+clients.  Getting updated rates quickly is a good idea, so I used
+their <a href="https://www.kraken.com/en-us/help/websocket-api">API
+documentation</a> and added Websocket support to the Kraken service in
+Valutakrambod today.  The python library can now get updates
+from Kraken several times per second, instead of every time the
+information is polled from the REST API.</p>
+
+<p>If this sound interesting to you, the code for valutakrambod is
+available from
+<a href="http://github.com/petterreinholdtsen/valutakrambod">github</a>.
+Here is example output from the example client displaying rates in a
+curses view:</p>
+
+<p><blockquote><pre>
+           Name Pair   Bid         Ask         Spr    Ftcd    Age
+ BitcoinsNorway BTCEUR   2959.2800   3021.0500   2.0%   36    nan    nan
+       Bitfinex BTCEUR   3087.9000   3088.0000   0.0%   36     37    nan
+        Bitmynt BTCEUR   3001.8700   3135.4600   4.3%   36     52    nan
+         Bitpay BTCEUR   3003.8659         nan   nan%   35    nan    nan
+       Bitstamp BTCEUR   3008.0000   3010.2300   0.1%    0      1      1
+           Bl3p BTCEUR   3000.6700   3010.9300   0.3%    1    nan    nan
+       Coinbase BTCEUR   2992.1800   3023.2500   1.0%   34    nan    nan
+         Kraken+BTCEUR   3005.7000   3006.6000   0.0%    0      1      0
+        Paymium BTCEUR   2940.0100   2993.4400   1.8%    0   2688    nan
+ BitcoinsNorway BTCNOK  29000.0000  29360.7400   1.2%   36    nan    nan
+        Bitmynt BTCNOK  29115.6400  29720.7500   2.0%   36     52    nan
+         Bitpay BTCNOK  29029.2512         nan   nan%   36    nan    nan
+       Coinbase BTCNOK  28927.6000  29218.5900   1.0%   35    nan    nan
+        MiraiEx BTCNOK  29097.7000  29741.4200   2.2%   36    nan    nan
+ BitcoinsNorway BTCUSD   3385.4200   3456.0900   2.0%   36    nan    nan
+       Bitfinex BTCUSD   3538.5000   3538.6000   0.0%   36     45    nan
+         Bitpay BTCUSD   3443.4600         nan   nan%   34    nan    nan
+       Bitstamp BTCUSD   3443.0100   3445.0500   0.1%    0      2      1
+       Coinbase BTCUSD   3428.1600   3462.6300   1.0%   33    nan    nan
+         Gemini BTCUSD   3445.8800   3445.8900   0.0%   36    326    nan
+         Hitbtc BTCUSD   3473.4700   3473.0700  -0.0%    0      0      0
+         Kraken+BTCUSD   3444.4000   3445.6000   0.0%    0      1      0
+  Exchangerates EURNOK      9.6685      9.6685   0.0%   36  22226    nan
+     Norgesbank EURNOK      9.6685      9.6685   0.0%   36  22226    nan
+       Bitstamp EURUSD      1.1440      1.1462   0.2%    0      1      2
+  Exchangerates EURUSD      1.1471      1.1471   0.0%   36  22226    nan
+ BitcoinsNorway LTCEUR      1.0009     22.6538  95.6%   35    nan    nan
+ BitcoinsNorway LTCNOK    259.0900    264.9300   2.2%   35    nan    nan
+ BitcoinsNorway LTCUSD      0.0000     29.0000 100.0%   35    nan    nan
+     Norgesbank USDNOK      8.4286      8.4286   0.0%   36  22226    nan
+</pre></blockquote></p>
+
+<p>Yes, I notice the strange negative spread on Hitbtc.  I've seen the
+same on Kraken.  Another strange observation is that Kraken some times
+announce trade orders a fraction of a second in the future.  I really
+wonder what is going on there.</p>
+
+<p>As usual, if you use Bitcoin and want to show your support of my
+activities, please send Bitcoin donations to my address
+<b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>