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Kraken Futures uses three separate controls for three different decisions: a limit order sets the price boundary, post-only (also called maker-only) controls whether the order may take liquidity immediately, and reduce-only limits the order to reducing an existing position. Because these controls govern different dimensions, post-only and reduce-only can be useful together for a closing order when the current instrument and interface support that combination.
What each order control actually governs
The easiest way to avoid mistakes is to treat the controls as independent questions rather than competing order types. Ask what price you will accept, whether an immediate match is allowed, and whether the resulting trade may increase your position.
| Control | Primary purpose | If the price would cross the spread | Can it increase exposure? | Does it guarantee a fill? |
|---|---|---|---|---|
| Limit | Sets the maximum buy price or minimum sell price | It may execute immediately; otherwise it can rest on the book | Yes, unless reduce-only is also selected | No |
| Post-only / maker-only | Requires maker-only behavior | Rejected or cancelled instead of executing immediately | Yes, unless reduce-only is also selected | No; it can be cancelled when it would take liquidity |
| Reduce-only | Restricts the position effect | Does not itself require maker execution; the underlying order type determines execution behavior | No; it can only reduce an existing position | No |
Kraken’s documentation uses both “maker-only” and “post-only” for the same execution intent. A limit order can therefore be submitted by itself, or with one or both of these modifiers where Kraken supports the combination.
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The price boundary
A limit order tells the exchange the worst price you will accept. For a buy, you specify the highest price you are willing to pay. For a sell, you specify the lowest price you are willing to receive. The order can execute at that price or at a better available price, but it should not execute beyond the stated boundary.
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Resting versus immediate execution
When there is not enough opposing demand or supply for an immediate match, Kraken adds the unfilled quantity to the order book. It then waits for other traders to trade against it. A buy limit placed below the available ask normally rests until sellers reach that price. A sell limit placed above the available bid normally rests until buyers reach it.
A limit order is not automatically maker-only. If your buy price reaches or exceeds available asks, or your sell price reaches or falls below available bids, the order may match immediately. That immediate portion is taking liquidity. Kraken’s rules also allow a limit order to be configured as maker-only and/or reduce-only, so the plain limit setting does not answer either of those separate questions.
Limit-order example
Suppose the best visible ask is higher than your chosen buy price. You submit a buy limit at your chosen level, and no seller is currently offering enough contracts there. The order waits in the book. It may later fill, fill only in part, or remain open if the market never trades at that level. If you instead enter a price that can match the current asks, the order may execute immediately unless post-only is enabled.
What post-only (maker-only) changes
It prevents an immediate match
Post-only is Kraken’s maker-only form of a limit order. Kraken describes it as a limit order that will be rejected and cancelled if the entered price would execute immediately. Exchange rules similarly state that a post-only order will not execute when its limit price immediately matches the buy or sell side of the order book.
For a buy, a price that reaches available asks would normally take liquidity; post-only prevents that by cancelling or rejecting the order instead. For a sell, a price that reaches available bids is treated the same way. The exact user-facing result can be shown as a rejection or cancellation, but the important outcome is that no immediate taker fill is allowed.
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What post-only does not do
Post-only does not guarantee that the order will fill. If the order is accepted and rests, the market still has to trade with it. The order can remain unfilled, fill partially, or be cancelled later according to your own cancellation action or the applicable exchange rules. Post-only also does not prevent the order from increasing exposure; it controls how the order interacts with the book, not whether the resulting position is larger.
Post-only entry example
You want to buy contracts near the current ask but insist on maker-only behavior. Submit a post-only buy limit at your chosen price. If that price is still outside the immediately executable range, the order rests. If the market has moved and the same price would now match an ask immediately, Kraken cancels or rejects it rather than filling it as a taker order. You must then choose whether to submit a new, less aggressive price or use a different order instruction.
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It protects the position direction
Reduce-only is a position safeguard. Kraken states that a reduce-only order only permits orders that reduce the number of open contracts in an existing position. It cannot open a new position and cannot add to an existing one.
For a long position, that normally means a reduce-only sell can close part or all of the long. For a short position, a reduce-only buy can close part or all of the short. The modifier is about the result after execution, not about whether the order rests or takes liquidity.
Oversized quantities are constrained
If the quantity requested is larger than the open position, Kraken says the quantity is automatically reduced to the size of that position. This prevents the order from continuing past zero and reversing you into the opposite direction. It does not mean the position will necessarily be closed: the order can still fill only partially, or not fill at all, depending on price and available liquidity.
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Reduce-only example
You hold a long position of 10 contracts and submit a reduce-only sell for 14 contracts. Kraken limits the permitted quantity to the open-position size rather than allowing the extra four contracts to create a short position. If the order is a limit order priced away from the market, it can rest until matched. If it is priced to cross the spread, it may execute immediately unless you also apply post-only.
Can post-only and reduce-only be used together?
They address different risks, so the combination is conceptually coherent. Post-only says, “Do not execute immediately as a taker.” Reduce-only says, “Do not increase or reverse my position.” A trader closing or trimming an existing position may want both protections on the same resting limit order.
Whether the combination is available for a particular Kraken Futures instrument, order ticket, or API request must be checked in the current interface and documentation. Supported combinations and labels can change. If both controls are accepted, the result is a limit order that must remain maker-only and may only reduce the existing position. If its price would immediately match, post-only can cancel or reject it; if its quantity exceeds the open position, reduce-only constrains the permitted quantity.
| Closing objective | Useful setting | What remains possible |
|---|---|---|
| Close at a chosen price, with no position safeguard | Limit | The order may rest or execute immediately and can potentially increase exposure if it is not reduce-only |
| Close only by resting as maker | Limit + post-only | The order can be rejected or cancelled if it would cross the spread; it may remain unfilled |
| Close without reversing | Limit + reduce-only | The order may still execute immediately because reduce-only does not impose maker-only behavior |
| Close without reversing and without taking liquidity | Limit + post-only + reduce-only, where supported | Both constraints apply; the order can be rejected for crossing or limited to the open position size |
How to place and verify an order in Kraken Futures
Interface labels and available combinations can change, so use the current Kraken Futures ticket for the exact instrument you are trading. The following sequence reflects the functions described in Kraken’s documentation without assuming a particular redesign of the screen.
- Open the Futures trading interface. Select the contract or instrument and confirm that the position shown is the one you intend to reduce or add to.
- Choose the limit order type. Enter the price boundary: the maximum price for a buy or the minimum price for a sell.
- Decide whether immediate execution is acceptable. If you require maker-only behavior, enable the control labelled Post-only or Maker-only. Be prepared for rejection or cancellation if the price would match immediately.
- Decide whether the order may change exposure. If the order is only for closing or trimming an existing position, enable Reduce-only if that option is available for the instrument.
- Enter quantity and review the result. Check side, price, quantity, and both modifiers before submitting. A reduce-only quantity larger than the open position may be automatically reduced to that position size.
- Confirm the order status. A resting order should appear as open on the book. A post-only order that would have executed immediately may instead show a rejected or cancelled status. An accepted reduce-only order should not be able to increase the position, but a fill is never guaranteed.
Do not infer that a setting was applied merely because the ticket accepted your price. Verify the displayed order details or status after submission, especially when combining modifiers.
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API terminology and order records
Kraken’s public Futures order-event schema includes separate orderType and reduceOnly fields. That separation mirrors the trading logic: the order type describes the execution instruction, while reduceOnly records the position restriction. API clients should therefore inspect both fields rather than assuming that a limit order is automatically reduce-only or maker-only.
Documentation and tools may call post-only orders “maker-only.” Treat those labels as equivalent execution intent, then confirm the exact parameter names and accepted combinations in the current API reference before sending a live request. The schema evidence establishes the explicit reduce-only field, but it does not by itself guarantee that every instrument accepts every possible combination.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Choosing the right control
Use a plain limit order when price is the main constraint
Choose a limit order when you care about the worst acceptable price and are willing to let the order either rest or execute immediately if the market is already at your price. This is the least restrictive of the three choices.
Add post-only when maker-only execution matters
Use post-only when an immediate taker fill would violate your plan. The trade-off is operational: an order that would otherwise fill can disappear as a rejection or cancellation, leaving you without a position change until you submit a new price.
Add reduce-only when the order must not add exposure
Use reduce-only for exits, partial closes, or position trimming where opening a new position or reversing direction is unacceptable. Remember that it does not force a resting order; combine it with post-only when maker-only behavior is also required and the current Kraken rules allow both.
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Common mistakes and how to diagnose them
“My post-only order was cancelled.”
The usual explanation is that the entered price would have matched the opposite side of the book immediately. Recheck the current bid and ask, then submit a less aggressive limit price if you still want a maker order.
“My reduce-only order did not fill.”
Reduce-only is a permission constraint, not a fill guarantee. A limit price may be away from the market, available liquidity may be insufficient, or a post-only setting may have prevented an immediate match.
“The quantity changed after I submitted.”
When reduce-only quantity exceeds the open position, Kraken says it automatically reduces the permitted quantity to that position size. Check the position and the order record before assuming that the original oversized amount remains active.
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Reduce-only alone does not require maker execution. If you need the order to avoid an immediate match, select post-only as a separate control, subject to support for that combination.
“I cannot find one of the controls.”
Availability can depend on the current interface, instrument, account context, or API version. Check the live order ticket and current Kraken Futures documentation rather than assuming that a control is supported everywhere.
What can change over time
The explanations above reflect Kraken support, exchange-rule, education, and API material current as accessed on October 16, 2026. Interface wording, supported combinations, regional rules, and fee schedules can change. Before submitting a live order, verify the current labels and instrument-specific rules in Kraken Futures and confirm the resulting order status after submission.
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