All transactions on the Ethereum network cost gas, a fee that is paid to miners in order to process the transaction. Trades on IDEX cost ~140k gas. Gas costs are about 1.5x higher than EtherDelta and slightly higher than 0x, but on IDEX there is no risk of competing for the same order and wasting this gas fee. Traders receive their chosen order regardless of how long the transaction takes to settle, so as the exchange grows IDEX can continue to use a normal gas price.

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