Self-trade Prevention
How Margin Trade prevents an account from matching against itself
Self-trade prevention stops an account from trading against itself.
If an incoming order would match a resting order from the same address, the resting order is canceled instead of matched.
What happens
No trade is executed
No trading fees are charged
The cancel does not appear in the public trade feed
The incoming order can continue matching against other resting liquidity, subject to its limit price and normal execution rules
Why this exists
This behavior prevents wash-like fills and avoids unnecessary internal crossing.
It is especially useful for market making strategies. An aggressing order can keep matching against other liquidity behind the canceled resting order instead of stopping on a self-match.
On centralized exchanges, this behavior is often called expire maker.
Scope
Self-trade prevention applies when both sides of the potential match belong to the same address.
It affects matching behavior only. Margin checks, price validation, and other order-entry rules still apply as normal.
See Orders for order behavior and Price Feeds for pricing guardrails.
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