Scale orders

Pick Scale in the ticket’s Advanced menu, set a price range, a number of orders and a total size, and send. The orders then rest on the exchange like any limit order you place yourself, whether or not Mirrorlane is open, until each one fills, you cancel it or it expires.

The prices are spaced evenly from From to To, with an order at each end. The sizes follow the weighting and add up to your total size. Each size rounds down to the market’s size step, and what the rounding leaves over goes back one step at a time, from the second order on. Prices round down to the market’s tick. The orders go out nearest to the market first.

Buying 1 ETH in 5 orders from 2,500 to 2,400 with Even weighting places 0.2 ETH at each of 2,500, 2,475, 2,450, 2,425 and 2,400. The average entry is 2,450.

With 8 orders or fewer, the ticket draws the ladder under the fields: each order’s price and size. The order details show the Average entry (the ladder’s price, weighted by size), Order value, the margin at your leverage and Fees. The button reads, for example, Place 5 buy orders, and the confirmation repeats the ladder in words.

Before anything is sent, every order is checked. If one breaks a rule, such as the market’s minimum size at its price, nothing is sent and the ticket names the order. The orders then go out together, up to 15 in one batch, and the exchange confirms each one on its own.

Setting	What it does
From	The price of the first order.
To	The price of the last order.
Orders	How many orders: 3, 5, 8, 10, 15 or 20. Press it to step through them. 5 by default.
Weighting	Even by default: equal sizes. Far 2× makes the order at To twice the size of the order at From. Near 2× makes the order at From twice the size of the order at To. Sizes in between change evenly.
Total size	All the orders together, in the asset or in dollars. A size in dollars is converted at the ladder’s average price.
Reduce only	Off by default. The orders can only make your position smaller. Perpetuals only.
Time in force	GTT by default: each order rests for up to 28 days. Post only: an order that would fill at once is cancelled by the exchange instead of taking liquidity.

• Up to 20 orders in one scale.
• Each order meets the market’s minimum size at its own price: the larger of the base and quote minimums, which apply to orders that rest.
• Open order limits. Plus accounts hold up to 750 open orders, at most 250 in one market. Premium holds up to 1,500, at most 1,000 in one market. More on Limits.
• Plus or Premium. On a Standard account, trading here is paused. See Account types.

Each order pays the fee of a limit order. The Fees row shows an estimate for the whole scale before you send it. See The fee.

• Part of the ladder crosses the book. An order priced past the best price on the other side fills at once as a taker, and the ticket warns: “This price crosses the book, so it fills at once as a taker.” With Post only, the exchange cancels that order instead.
• Some orders don’t make it. Each order stands on its own, so the exchange can place part of a scale and refuse the rest. The note under the button says how many were sent, such as “3 of 5 sent”, with the first reason, and a notice gives the reason for an order the exchange cancels. Place the missing ones again yourself; nothing is resent for you.
• No answer comes back. The orders show as Confirming in Open orders until the exchange reports them. One that never appears shows as Not placed, and the ticket says it was most likely refused. Nothing is sent twice.
• Your margin for new orders runs short. Orders resting on the book count against the margin available for new orders, so a large ladder leaves less room to open others. See Leverage and margin.

Each order of the scale is listed in Open orders, and a notice tells you as orders fill. Cancel one there, the ones you select, or all of them. What has filled stays filled.