Tool · market or limit
Order type decision helper
Both order types are defensible for a first purchase and the difference is smaller than the internet suggests. What actually decides it is three things about you rather than anything about the market.
How soon do you want this finished?
Do you have a price in mind, and a reason for it?
Will you actually come back and check whether it filled?
Suggestion
Market order
A market order fills immediately at whatever the book offers. With no view on price and no appetite for waiting, this is the option that matches what you actually want.
The trade-off
You accept whatever the current price is, and you pay the higher taker fee tier. On a liquid pair at a small size, both of those are minor — the difference between fee tiers is a fraction of a percent, and the depth at the top of the book far exceeds a first purchase.
Suggestion
Market order
Immediate fill, nothing to come back to. Given that you want it done today and would not chase an unfilled order, anything that can rest in the book is the wrong instrument.
The trade-off
You pay the higher fee tier and accept the current price. The real alternative here is not a limit order — it is an order you forget about, which is worse than either.
Suggestion
Limit order at or just above the current price
You have a number, so use it as a ceiling rather than a target. Set the limit at, or fractionally above, the current price: it fills almost immediately, and you have a hard cap on what you pay.
The trade-off
It may not fill instantly if the price moves up in the moment you are typing. That is the entire risk, and it is why the limit is set at or above the market rather than below it.
Suggestion
Market order, despite the price in mind
Wanting it done today and not intending to check makes a resting order a liability. Your price is better used as a decision about whether to buy at all than as an instruction to the exchange.
The trade-off
You give up the price ceiling entirely. If the number genuinely matters to you, the honest option is the other branch: leave it open and check. Choosing not to check is choosing not to use the price.
Suggestion
Limit order at or fractionally above the current price
You can wait and you will check, so take the lower maker fee tier — but without a number you can defend, do not set the limit below the market. Place it at the current price and let it rest briefly.
The trade-off
You get the better fee tier and a price ceiling. What you do not get is a lower price, because there is no reason to expect one. A limit set below the market without a rationale is a prediction wearing the costume of caution.
Suggestion
Market order
You are willing to wait but would not come back to look. That combination produces the classic dead order: something resting in the book for a week while you assume it is done.
The trade-off
You pay the higher fee tier for certainty. The alternative is not saving a fraction of a percent — it is discovering in a month that you never actually bought anything.
Suggestion
Limit order at your price
This is the case limit orders exist for. You have a number, a reason, and the willingness to monitor it. Place it and leave it.
The trade-off
It may never fill. Decide now what you will do if the price moves away instead of toward you, and write it down — the failure mode is cancelling in frustration a week later and buying at market anyway, at a worse price than you started with.
Suggestion
Limit order with an expiry, or reconsider
A price you will not monitor is a plan with no second half. If your platform offers a time limit on the order, set one so it expires rather than resting indefinitely.
The trade-off
Without an expiry this order can sit for weeks with your funds reserved against it. If no expiry option exists, the more honest choice is to treat this as a market order decision — or to wait until you are able to watch it.
Answer all three and a suggestion appears here, with its trade-off next to it.
How the suggestions are decided, and what this tool refuses to do
How the suggestion is decided
Three inputs, eight combinations, one written answer for each. There is no scoring, no weighting, and nothing hidden: every possible outcome is written into this page as plain text, and you could read all eight by viewing the source. Nothing is calculated from market data, because nothing here depends on market data.
Why these three questions
- Timing decides whether an order that might rest unfilled is acceptable at all.
- A defensible price is the only thing that justifies setting a limit below the market. Without one, a limit order below the current price is a prediction, not caution — and that distinction is the most common confusion around order types.
- Whether you will check is the question nobody asks and the one that produces the worst outcomes. A resting order that is never revisited is how people discover a month later that they never bought anything.
What this tool will not do
It will not suggest a price, a size, or a moment. It has no idea what the market is doing and does not try to find out. The output is a mechanic — which instruction to give the exchange — and nothing more than that. Anything on the internet that claims to tell you when is guessing, usually with a reason to want you to act.
Where it is deliberately conservative
Two of the eight combinations recommend a market order to someone who said they could wait. That looks wrong until you notice which two: both involve someone who will not come back to check. In those cases the risk of an order resting forgotten outweighs a fraction of a percent in fees, and the tool says so rather than optimising the number that is easier to measure.
What it does not store
Nothing. Your answers exist in the page while it is open and disappear when you close the tab. There is no account, no cookie, and no request to any server — unlike the roadmap, which does keep your ticks locally because remembering them is the point of that tool.
Related
- Market order or limit order? — what the matching engine actually does with each instruction.
- Can I cancel a crypto purchase? — an unfilled limit order is the one thing here that can be cancelled freely.