blog/data/2019-02-01-valutakrambod-kraken-websocket.txt

   1 Title: Websocket from Kraken in Valutakrambod
   2 Tags: english, bitcoin
   3 Date: 2019-02-01 22:25
   4
   5 <p>Yesterday, the Kraken virtual currency exchange announced
   6 <a href="https://blog.kraken.com/post/2019/websockets-public-api-launching-soon/">their
   7 Websocket service</a>, providing a stream of exchange updates to its
   8 clients.  Getting updated rates quickly is a good idea, so I used
   9 their <a href="https://www.kraken.com/en-us/help/websocket-api">API
  10 documentation</a> and added Websocket support to the Kraken service in
  11 Valutakrambod today.  The python library can now get updates
  12 from Kraken several times per second, instead of every time the
  13 information is polled from the REST API.</p>
  14
  15 <p>If this sound interesting to you, the code for valutakrambod is
  16 available from
  17 <a href="http://github.com/petterreinholdtsen/valutakrambod">github</a>.
  18 Here is example output from the example client displaying rates in a
  19 curses view:</p>
  20
  21 <p><blockquote><pre>
  22            Name Pair   Bid         Ask         Spr    Ftcd    Age
  23  BitcoinsNorway BTCEUR   2959.2800   3021.0500   2.0%   36    nan    nan
  24        Bitfinex BTCEUR   3087.9000   3088.0000   0.0%   36     37    nan
  25         Bitmynt BTCEUR   3001.8700   3135.4600   4.3%   36     52    nan
  26          Bitpay BTCEUR   3003.8659         nan   nan%   35    nan    nan
  27        Bitstamp BTCEUR   3008.0000   3010.2300   0.1%    0      1      1
  28            Bl3p BTCEUR   3000.6700   3010.9300   0.3%    1    nan    nan
  29        Coinbase BTCEUR   2992.1800   3023.2500   1.0%   34    nan    nan
  30          Kraken+BTCEUR   3005.7000   3006.6000   0.0%    0      1      0
  31         Paymium BTCEUR   2940.0100   2993.4400   1.8%    0   2688    nan
  32  BitcoinsNorway BTCNOK  29000.0000  29360.7400   1.2%   36    nan    nan
  33         Bitmynt BTCNOK  29115.6400  29720.7500   2.0%   36     52    nan
  34          Bitpay BTCNOK  29029.2512         nan   nan%   36    nan    nan
  35        Coinbase BTCNOK  28927.6000  29218.5900   1.0%   35    nan    nan
  36         MiraiEx BTCNOK  29097.7000  29741.4200   2.2%   36    nan    nan
  37  BitcoinsNorway BTCUSD   3385.4200   3456.0900   2.0%   36    nan    nan
  38        Bitfinex BTCUSD   3538.5000   3538.6000   0.0%   36     45    nan
  39          Bitpay BTCUSD   3443.4600         nan   nan%   34    nan    nan
  40        Bitstamp BTCUSD   3443.0100   3445.0500   0.1%    0      2      1
  41        Coinbase BTCUSD   3428.1600   3462.6300   1.0%   33    nan    nan
  42          Gemini BTCUSD   3445.8800   3445.8900   0.0%   36    326    nan
  43          Hitbtc BTCUSD   3473.4700   3473.0700  -0.0%    0      0      0
  44          Kraken+BTCUSD   3444.4000   3445.6000   0.0%    0      1      0
  45   Exchangerates EURNOK      9.6685      9.6685   0.0%   36  22226    nan
  46      Norgesbank EURNOK      9.6685      9.6685   0.0%   36  22226    nan
  47        Bitstamp EURUSD      1.1440      1.1462   0.2%    0      1      2
  48   Exchangerates EURUSD      1.1471      1.1471   0.0%   36  22226    nan
  49  BitcoinsNorway LTCEUR      1.0009     22.6538  95.6%   35    nan    nan
  50  BitcoinsNorway LTCNOK    259.0900    264.9300   2.2%   35    nan    nan
  51  BitcoinsNorway LTCUSD      0.0000     29.0000 100.0%   35    nan    nan
  52      Norgesbank USDNOK      8.4286      8.4286   0.0%   36  22226    nan
  53 </pre></blockquote></p>
  54
  55 <p>Yes, I notice the strange negative spread on Hitbtc.  I've seen the
  56 same on Kraken.  Another strange observation is that Kraken some times
  57 announce trade orders a fraction of a second in the future.  I really
  58 wonder what is going on there.</p>
  59
  60 <p>As usual, if you use Bitcoin and want to show your support of my
  61 activities, please send Bitcoin donations to my address
  62 <b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>