Just found out 2.5:1 is considered pushing so I have to take that back.
Standard trading rated apply
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Trades that mean an unfair profit to the higher ranked player by falling outside the following range of ratios will be considered as Pushing cases:
3:2:1 Where each unit of deuterium is worth 2 units of crystal or 3 units of metal.
2:1:1 Where each unit of deuterium is worth 1 unit of crystal or 2 units of metal.
These trade rates are valid for all universes at OGame.org.