Prior to a new market going live on the exchange, the order books need to be sufficiently filled to ensure liquidity in the market (so that customers are able to buy and sell). We do this via post-only orders.
When a new market is in Post-only mode, only limit orders can be placed.
Unlike usual limit orders, post-only limit orders will only be added to the order book if they do not result in any matched trades at the time of placement. If any part of the order results in trade execution, the order will be automatically cancelled and the customer will be notified:
Successfully placed post-only orders will be added to the order books and customers will see a notification that the order has been successfully placed:
Post-only orders can still be cancelled prior to a market being activated, in the same way limit order are cancelled.
Please note: Once the market is activated, post-only orders convert to regular limit orders and may execute at any time depending on market movements.