Introducing the Fat Finger Protection Trading Rule

BitMEX

On 16 February 2021 at 08:00 UTC, we will be introducing the Fat Finger Protection Trading Rule.

The rule applies to both Market and Limit orders. 

Market orders will be restricted by the maximum Impact Price of: 

  • Buy orders: 5% above Best Ask or Mark Price (whichever is higher)
  • Sell orders: 5% below Best Bid or Mark Price (whichever is lower)

Users will have their limit order rejected should an order meet the below criteria:

  • Buy orders: Limit price is more than 5% above Best Ask or Mark Price (whichever is higher) and order size is larger than the current Best Ask size.
  • Sell orders: Limit price is more than 5% below Best Bid or Mark Price (whichever is lower) and order size is larger than current Best Bid size.

Please see our blog for more information.