IB white branding: https://www.interactivebrokers.com/en/index.php?f=14322 Is Zacks Trade an IB white branding broker? https://www.zackstrade.com/trading-platforms/ Are there others?
The most common tools to control risk in buying and selling currencies are limited orders and "stop loss" orders. A limited order places restrictions with respect to the maximum price to pay or minimum price to receive.