The exchanges already have various controls. CME has up/down limits that have to be manually lifted; they also fine people if they exceed the connection limits

The exchanges already have various controls. CME has up/down limits that have to be manually lifted; they also fine people if they exceed the connection limits on their lines and investigate if the ratio between orders and trades is too high. Eurex (big European futures exchange) has fast market and also volatility interrupts too. e.g. http://www.eurexchange.com/exchange-en/trading/production-newsboard/VOLATILITY_INTERRUPT/1355740 http://www.eurexchange.com/exchange-en/trading/production-ne... (this is the Swiss FX futures contract).