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Coming soon: order placement over WebSocket becomes available on September 2, 2026, on the global platform only. The EU platform is not yet supported.
Place a margin or futures limit order that rests in the order book until it is matched or canceled. This is the counterpart of order_limit_place, and like its spot twin it is the only method in the collateral_* family that accepts rpi.

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Rate limits

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Place margin limit order

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Request parameters

Two parameters set this family apart from the spot methods. The reduce_only flag restricts the order to shrinking an existing position, and position_side selects the position leg in hedge mode. Both are described in Margin & Futures orders. Across the whole collateral_* family amount is stock on both sides. Leverage and margin come from the account collateral configuration and are not order parameters — see Margin Trading and Futures.

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Response

The result object is the standard order object plus reduce_only and position_side — see the order object reference. A margin limit order reports type 7.
Hedge mode governs position_side. The field is optional at the request layer but functionally required once hedge mode is enabled — omitting it, or sending BOTH, returns error 114, same as sending a value other than BOTH without hedge mode enabled. A switch in progress returns error 113. On a non-futures margin market any value other than BOTH is rejected with error 1.

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Error codes

Standard transport errors and the shared account, rate-limit, and region codes are listed in Order Management.