Many gateways prefer the low-risk approach of one-for-one redemption and will simply allow the GatewayUSD to float against BitUSD with a small but variable spread in the market. Users then pay a small variable conversion cost as they exit from BitUSD to fiat USD through GatewayUSD.
On the other hand, many users will want a direct conversion from BitUSD to fiat USD. In this mode of operation, the gateway takes care of providing all of the liquidity within a fixed percentage transaction fee. The gSee full review