Self-Trade Prevention

What Is Self-Trading?

Self-trading occurs when your own buy and sell orders match against each other in the matching engine. This can happen unintentionally when you run multiple strategies at the same time.

How self-trading affects you:

• Strategy disruption — One strategy's buy order fills against another strategy's sell order. Both sides move, yet no actual entry or exit is achieved.

• Unnecessary fee loss — No real gain is made, but fees are still charged on both sides.

• Unexpected position changes — Especially on low-liquidity pairs, self-trading can cause your position to drift from its intended target.

The Self-Trade Prevention (STP) feature automatically handles self-trade situations according to your preset strategy, preventing the above issues.

The STP will apply to futures order. The following are all considered self-trades: orders within the same account, orders between a master-account and its sub-accounts, and orders between sub-accounts under the same master account.

What happens when STP is triggered?

Strategy	Behavior	Best For
Cancel Maker Only (Default)	Cancels the maker order; the taker continues to match against the next available level	Prioritizing the execution of the taker side
Cancel Taker Only	Cancels the taker order; the maker order remains on the book	Protecting existing maker orders
Cancel Both	Cancels both orders simultaneously	Most conservative — eliminates self-trading entirely

Reminder: Accounts default to the Cancel Maker Only strategy.

FAQs

Q: Does STP affect the portion of an order that has already been filled? No. STP only applies to the remaining unfilled quantity at the moment it is triggered.

Q: What happens if I don't include the stpMode parameter when placing an order via API? The system will automatically apply the account's current global STP setting.

Q: Is STP supported for FOK orders? No. Orders with timeInForce set to FOK or GTX are not subject to STP.