Trade settings - Spreader

Open Settings › Trade (/settings/trade). Each switch saves at once.

Opening a position

Balance legs automatically: On or Off. Some exchanges take a market buy on spot as an amount in USDT, so slippage and the fee paid in the coin leave the spot leg slightly smaller than the perp leg.

Setting	Behaviour
On	After opening in Semi, the larger leg is reduced to the smaller one with one extra order when the smaller leg cannot be topped up. A difference up to 0.5 % of the position is left as it is.
Off	The difference stays. The position shows `legs differ` and the Balance legs button.

Auto mode

Chunk orders: IOC limit or Market.

Setting	Behaviour
IOC limit	Each chunk is a limit order that fills at once or is cancelled, capped at the worst price of the chunk: never worse than Min In, but a leg may fill partly, Auto then evens the legs.
Market	Each chunk is a market order on both legs: legs always equal, but the fill may be worse than Min In when the book moves.