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Market Observer


This oxp enhances the market screen with valuable data. To keep this enhancement free, ads from various advertisers are shown in the market screen.

Core Features

1. Market Reference Gatherer

This feature monitors the prices of system markets and keeps a list of average prices. This data is printed to the market screen.

2. System Price Difference Viewer

This feature prints the difference of station prices compared to the averages as absolute and percentage value to the market screen. Gives a quick overview of what is cheap and what expensive.

3. Purchase Log

Purchase log is collected from purchaces at the standard market. When selling, the log is purged starting from the most expensive purchases. The most expensive purchase is printed to the market screen. Helps to determine, if it's worth to sell or not. A more detailed view is available in the detailed commodity view (f8-f8).

If cargo is lost, lost cargo is purged from the log when docking at any station.

4. Ads From YAH

Various ads from Your Ad Here! OXP are shown in the bottom of the market screen. This feature can't be toggled off, it keeps this enhancement free :).

OXP has an api for adding even more ads to the mix.

  • Simply call worldScripts["mo_ad_service"]._setHorzAd('filename_of_your_horizontal_ad') in startUp and that's it. Ads need to be in 256x128 resolution.

5. Trader's Rating

Market Observer monitors the profit you gain from buying and selling at the standard market and gives you a rating. Profit is calculated when selling a commodity that's purchase has been logged. No profit is calculated from salvaging or contracting etc, unless some purchased cargo is lost. Player is given a Trader's Rating based on profit made. Rating is shown on market screen.

First rank at 1500 cr. Highest rank at 1000000 cr.


  • Oolite version 1.82 or higher.


  • All ads are selected and cropped from Your Ad Here! oxp and Your Ad Here! forum thread. Ads are made by different Oolite players.


  • Download the latest version (for Oolite 1.82) from the expansion manager.
  • Download version 2.3.2 (for Oolite 1.79) from the expansion manager. Oxz version includes the trader's rating addon.
  • Download version 2.2.3 (for Oolite 1.77) from the box.
  • Only for the version 2.2.3. Download an update (1.2) to the Commodity Markets OXP addon from the box. This update preserves buy/sell prices over saves. Update by laxori666.


Install the OXP by copying marketObserver.oxp to your AddOns-folder.

Quick Facts

Version Released License Features Category Author(s) Feedback
3.6 2018-02-24 CC BY-NC-SA 4.0 Statistics Equipment OXPs Spara Oolite BB