IDEX has instituted a minimum order of 0.15 ETH (equivalent) for makers, and 0.05 ETH (equivalent) for takers.

IDEX’s design includes trade matching which ensures traders get matched with the best priced orders on the books. However, this price doesn’t account for the cost of gas. If there were no maker minimums, then it would be possible for users to place tiny limit orders on the books that force takers to waste gas unnecessarily.

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