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Tuesday, August 28, 2012

XChange - Open Source Java API for MtGox Bitcoin Exchange


UPDATE March 9, 2013: Version 1.5.0 released. Support for 10 exchanges.

UPDATE Jan 31, 2013: Version 1.4.0 released. Support for Canadian Virtual Exchange. Mostly bug fixes.

UPDATE Jan 16, 2013: Version 1.3.0 released. Support for many more exchanges. See release notes and also XChange Release 1.3.0 Announcement

UPDATE Oct 11, 2012: Version 1.2.0 released. Support for Canadian Virtual Exchange.

Supported Exchanges

Together with other members from the Bitcoin community, I've recently created a new open source Java library called XChange. XChange is a Java library providing a simple and consistent API for interacting with a diverse set of financial security exchanges including Bitcoin. The first exchange implemented is the world's largest Bitcoin exchange - Mt Gox. The plan is to add more Bitcoin exchanges and other traditional financial exchanges offerring trading APIs such as Interactive Brokers.

As of the most recent release 1.1.0, Xchange offers the following functionality:
  • Support for MtGox Bitcoin Exchange (public) polling market data (ticker, depth, trades, etc.)
  • Support for MtGox Bitcoin Exchange (private) polling trade data (account info, market order, limit order, cancel order open orders, etc.)
  • Support for MtGox Bitcoin Exchange (public) streaming market (ticker)
Next up on the todo list is:
  • Support for MtGox Bitcoin Exchange (public) streaming market (depth, trades, etc.)
  • Support for MtGox Bitcoin Exchange (private) streaming trade data (account info, market order, limit order, cancel order open orders, etc.)

Relevant Links

Project Home - http://xeiam.com/xchange.jsp
Code on Github - https://github.com/timmolter/XChange
Example Code - http://xeiam.com/xchange_examplecode.jsp

Examples

The following examples demonstrate getting Ticker data from MtGox, first using the polling API, and second using the streaming API.

Ticker via Polling API

package com.xeiam.xchange.examples.mtgox.v1.polling;

import com.xeiam.xchange.Currencies;
import com.xeiam.xchange.Exchange;
import com.xeiam.xchange.ExchangeFactory;
import com.xeiam.xchange.dto.marketdata.Ticker;
import com.xeiam.xchange.service.marketdata.polling.PollingMarketDataService;

/**
 * Test requesting polling Ticker at MtGox
 */
public class TickerDemo {

  private static PollingMarketDataService marketDataService;

  public static void main(String[] args) {

    // Use the factory to get the version 1 MtGox exchange API using default settings
    Exchange mtGox = ExchangeFactory.INSTANCE.createExchange("com.xeiam.xchange.mtgox.v1.MtGoxExchange");

    // Interested in the public polling market data feed (no authentication)
    marketDataService = mtGox.getPollingMarketDataService();

    // Get the latest ticker data showing BTC to USD
    Ticker ticker = marketDataService.getTicker(Currencies.BTC, Currencies.USD);
    double value = ticker.getLast().getAmount().doubleValue();
    String currency = ticker.getLast().getCurrencyUnit().toString();
    System.out.println("Last: " + currency + "-" + value);

    System.out.println("Last: " + ticker.getLast().toString());
    System.out.println("Bid: " + ticker.getBid().toString());
    System.out.println("Ask: " + ticker.getAsk().toString());

    // Get the latest ticker data showing BTC to EUR
    ticker = marketDataService.getTicker(Currencies.BTC, Currencies.EUR);
    System.out.println("Last: " + ticker.getLast().toString());
    System.out.println("Bid: " + ticker.getBid().toString());
    System.out.println("Ask: " + ticker.getAsk().toString());

    // Get the latest ticker data showing BTC to GBP
    ticker = marketDataService.getTicker(Currencies.BTC, Currencies.GBP);
    System.out.println("Last: " + ticker.getLast().toString());
    System.out.println("Bid: " + ticker.getBid().toString());
    System.out.println("Ask: " + ticker.getAsk().toString());

  }

}
Result:
Last: USD-5.14739
Last: USD 5.14739
Bid: USD 5.12011
Ask: USD 5.1299

Last: EUR 4.07
Bid: EUR 4.0527
Ask: EUR 4.07

Last: GBP 3.3452
Bid: GBP 3.3
Ask: GBP 3.34091

Ticker via Streaming API

package com.xeiam.xchange.examples.mtgox.v1.streaming;

import java.util.concurrent.BlockingQueue;

import com.xeiam.xchange.Currencies;
import com.xeiam.xchange.Exchange;
import com.xeiam.xchange.dto.marketdata.Ticker;
import com.xeiam.xchange.mtgox.v1.MtGoxExchange;
import com.xeiam.xchange.service.marketdata.streaming.StreamingMarketDataService;

/**
 * Test requesting streaming Ticker at MtGox
 */
public class TickerDemo {

  public static void main(String[] args) {

    TickerDemo tickerDemo = new TickerDemo();
    tickerDemo.start();
  }

  private void start() {

    // Use the default MtGox settings
    Exchange mtGox = MtGoxExchange.newInstance();

    // Interested in the public streaming market data feed (no authentication)
    StreamingMarketDataService streamingMarketDataService = mtGox.getStreamingMarketDataService();

    // Get blocking queue that receives streaming ticker data
    BlockingQueue tickerQueue = streamingMarketDataService.requestTicker(Currencies.BTC, Currencies.USD);

    // take streaming ticker data from the queue and do something with it
    while (true) {
      try {
        // Put your ticker event handling code here
        doSomething(tickerQueue.take());
      } catch (InterruptedException e) {
        e.printStackTrace();
      }
    }
  }

  /**
   * Do something fun with the streaming data!
   * 
   * @param ticker
   */
  private void doSomething(Ticker ticker) {

    System.out.println(ticker.toString());
  }

}
Result:
Ticker [timestamp=2012-08-26T20:09:13.202Z, last=USD 10.6, bid=USD 10.55248, ask=USD 10.6, tradableIdentifier=BTC, volume=3078691906206]
Ticker [timestamp=2012-08-26T20:09:18.651Z, last=USD 10.6, bid=USD 10.55248, ask=USD 10.6, tradableIdentifier=BTC, volume=3068691906206]
Ticker [timestamp=2012-08-26T20:09:19.568Z, last=USD 10.6, bid=USD 10.55248, ask=USD 10.6, tradableIdentifier=BTC, volume=3068691906206]
Ticker [timestamp=2012-08-26T20:09:23.152Z, last=USD 10.6, bid=USD 10.55248, ask=USD 10.6, tradableIdentifier=BTC, volume=3068691906206]
Ticker [timestamp=2012-08-26T20:09:23.975Z, last=USD 10.6, bid=USD 10.55248, ask=USD 10.6, tradableIdentifier=BTC, volume=3068691906206]
Ticker [timestamp=2012-08-26T20:09:24.790Z, last=USD 10.6, bid=USD 10.55248, ask=USD 10.6, tradableIdentifier=BTC, volume=3068691906206]
Ticker [timestamp=2012-08-26T20:09:25.205Z, last=USD 10.6, bid=USD 10.55248, ask=USD 10.6, tradableIdentifier=BTC, volume=3068691906206]
Ticker [timestamp=2012-08-26T20:09:26.018Z, last=USD 10.6, bid=USD 10.55248, ask=USD 10.6, tradableIdentifier=BTC, volume=3068691906206]
Ticker [timestamp=2012-08-26T20:09:26.543Z, last=USD 10.6, bid=USD 10.55248, ask=USD 10.6, tradableIdentifier=BTC, volume=3068691906206]
Piece of Cake!!!

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