https://phemex.com/help-center/type-of-orders-on-phemex
Reduce Only is a special order condition that only allows you to reduce or close a current position you hold. If a Reduce Only order were to increase your position in any way, it will either be immediately canceled or the contract size will be adjusted to prevent an increase.
For any inquiries contact us at support@phemex.zendesk.com
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