2009.3 (view changes)
Updated December 31, 2009:

ALL math uses BigDecimal

Markets

Prices update as others trade.

Charts generate in background.

Experiments

Mark-to-Market (w/lending)

Insider Manip (w/short sales)

Browse the sources.

Read the Javadoc.

View screenshots.

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YourKit, LLC creates innovative tools for profiling Java and .NET applications.

Zocalo is a toolkit for building prediction markets, markets in securities that pay out depending on outcomes of future events. They provide estimates of the likelihood of specific outcomes that are more reliable than other sources of predictions. more

The Zocalo Project Lead is Chris Hibbert.

• Visit the Zocalo project page at SourceForge.
• Want to help? Read our development plans.
• What does Zocalo mean?

Chris Hibbert's articles on Prediction Market mechanisms
• PM intro: basic formats (2005-12-30)
• PMs with Open-ended Prices (2006-01-05)
• Looking at Both Sides (2006-04-17)
• Book and Market Maker (2006-04-28)
• Liquidity in N-Way claims (2006-07-19)
• Continuous Outcomes using Bands and Ladders (2006-09-20)
• Integrating Book Orders and Market Makers (2007-01-10)
• Conditional and Combinatorial Betting (2007-03-06)
• Market Makers for Multi Outcome Markets(2007-09-10)