crypto market orders and limit orders
Crypto investing involves more than choosing a digital asset and deciding how much to spend. The instructions used to place a trade can affect its execution price, timing and total cost.
A price displayed on a chart is not necessarily the price available for your entire order. Market conditions can change, and the amount available at a particular price may be limited.
Market orders, limit orders and slippage help explain these differences. Understanding them allows investors to review what they are requesting before confirming a transaction.
This OptimCoins guide explains general trading concepts. Available order types and execution rules should be checked with the platform being used.
What Is a Trading Order?
A trading order is an instruction to buy or sell an asset under specified conditions.
Depending on the platform, an order may identify:
- The asset or trading pair.
- Whether you want to buy or sell.
- The quantity or amount to spend.
- The order type.
- A price limit, where applicable.
- How long the order remains active.
For example, buying an asset with Australian dollars is different from exchanging it for another cryptocurrency. Check the trading pair and currency before entering an amount.
An order submission is also different from a completed transaction. An order may remain open, execute partially, expire or be rejected.
1. Market Orders Prioritise Prompt Execution
A market order requests a purchase or sale at the available market prices when the order reaches the trading system.
It generally prioritises execution over setting a specific price. However, it does not guarantee the price shown when you first opened the order screen.
On an order-book exchange, a market buy takes available sell orders. A market sell takes available buy orders. If insufficient quantity is available at the best price, the order may execute across several price levels.
Trading restrictions, insufficient liquidity and platform protection rules can also prevent full execution. Coinbase’s order documentation illustrates how market-order handling depends on the trading venue’s rules.
A Simple Market Order Example
Suppose an illustrative crypto asset has the following sell offers:
- 3 units at A$100 each.
- 4 units at A$101 each.
A market order to buy 5 units could purchase:
- 3 units at A$100 = A$300.
- 2 units at A$101 = A$202.
The total purchase value would be A$502, excluding fees.
The average execution price would be:
A$502 ÷ 5 = A$100.40 per unit.
Although the best available offer was A$100, there was not enough quantity at that price to fill the entire order.
This simplified example assumes the offers remain available when the order executes.
2. Limit Orders Set a Price Boundary
A limit order specifies the maximum price you will pay when buying or the minimum price you will accept when selling.
A buy limit order can execute at the limit price or lower. A sell limit order can execute at the limit price or higher.
The trade-off is execution uncertainty. The order may remain unfilled or execute only partially.
A Buy Limit Order Example
Suppose an asset is available to buy at approximately A$105.
You place a buy limit order for 5 units with a limit of A$100 per unit.
The instruction allows purchases at A$100 or below. It does not authorise buying at A$105.
If suitable sell offers become available, the order may execute. If they do not, it may remain open until cancelled or expired under the selected settings.
A Sell Limit Order Example
Suppose you hold an asset trading around A$100.
You place a sell limit order at A$110.
The order allows a sale at A$110 or above. It does not guarantee that buyers will become available at that price.
A sell limit order above the current market is not protection against a price decline.
3. A Limit Order Can Execute Immediately
Limit orders do not always wait for the market to move.
If a buy limit is high enough to match existing sell offers, it may execute immediately. Similarly, a sell limit may execute immediately if it matches available buy offers.
For example, if sufficient sell quantity is available at A$100, a buy limit of A$102 may fill at A$100.
The limit is a price boundary, rather than a requirement to execute at exactly that price.
Whether an order executes immediately or rests in the order book can also affect fees.
4. Slippage Describes a Difference in Execution Price
Slippage is the difference between an expected or reference price and the price actually achieved.
It can occur when prices change before execution or when an order consumes the quantity available across several price levels.
Slippage can be unfavourable or favourable:
- A buyer pays more than expected: unfavourable slippage.
- A buyer pays less than expected: favourable slippage.
- A seller receives less than expected: unfavourable slippage.
- A seller receives more than expected: favourable slippage.
Low liquidity and changing market conditions can increase execution-price differences.
A Simple Slippage Calculation
Suppose your reference price for a purchase is A$100 per unit, but the average execution price is A$101.
The unfavourable difference is A$1 per unit.
Using the reference price as the denominator:
Slippage percentage = ((A$101 − A$100) ÷ A$100) × 100
Slippage percentage = 1%.
State which reference price you are using. The last traded price, best available offer and order-preview estimate can differ.
Fees should be calculated separately unless the measure explicitly includes them.
5. Liquidity Affects How Orders Execute
Liquidity concerns how readily an asset can be bought or sold without substantially changing its price.
For an order-book market, relevant information includes the quantities available at different buying and selling prices.
A large order relative to available liquidity may move through several price levels. A smaller order may also face poor execution conditions in a thin market.
Review:
- The best available buying and selling prices.
- Quantities available near those prices.
- Your order size.
- The relevant trading pair.
- How quickly displayed orders are changing.
An order book is a snapshot. Other participants can change or cancel orders before your transaction executes.
6. Spread, Slippage and Fees Are Different
These costs and price differences should be reviewed separately.
Bid–Ask Spread
The bid is the highest available buying price. The ask is the lowest available selling price.
The difference between them is the bid–ask spread.
For example:
Best bid: A$99.
Best ask: A$100.
Spread: A$1.
A displayed last traded price may differ from both.
Slippage
Slippage compares the actual execution price with a defined reference or expected price.
Trading Fees
Trading fees are charges applied under the platform’s fee schedule.
Some services also include a spread or markup in their quoted price. Check how the provider describes its pricing.
A limit order controls the execution-price boundary, but separate fees can still increase the total purchase cost or reduce sale proceeds.
7. Partial Fills Require Attention
An order can execute in several parts.
Suppose you place a limit order to buy 10 units, but only 4 units are available within your price limit.
The order may fill 4 units while the remaining 6 stay open, depending on its settings.
Before placing another order, check:
- How much has executed.
- The average execution price.
- The remaining quantity.
- Fees charged.
- Whether the remainder is still active.
Otherwise, a second order could create more exposure than intended.
Cancelling an open order generally affects only the portion that has not executed. A cancellation request may also race with execution, so confirm the final status.
8. Order Duration Changes What Happens Next
Platforms may offer different instructions for how long an order remains active.
Examples include:
- Good till cancelled: The order remains active until filled or cancelled, subject to platform rules.
- Immediate or cancel: Available quantity executes immediately, and the remainder is cancelled.
- Fill or kill: The entire quantity must execute immediately or the order is cancelled.
- Time-limited orders: The order expires at a specified time.
Not every platform offers these options.
An old open order may execute after your circumstances or intentions have changed. Review outstanding orders regularly.
9. Maker and Taker Fees Depend on Execution
Some exchanges distinguish between orders that add liquidity and orders that remove it.
An order that rests in the order book generally adds liquidity and may receive maker pricing.
An order that immediately matches existing orders removes liquidity and may receive taker pricing.
A limit order can therefore incur taker fees if it executes immediately. Some orders can have portions treated differently.
Check the applicable fee schedule rather than assuming that every limit order is cheaper.
Market Orders and Limit Orders: A Comparison
Feature | Market Order | Limit Order |
Main instruction | Trade at available market prices | Trade at the specified price or better |
Price control | No user-set limit price | Maximum buy price or minimum sell price |
Execution timing | Generally seeks prompt execution | May execute immediately or wait |
Full execution | Depends on liquidity and platform rules | Depends on available matching quantity |
Main trade-off | Execution price may differ from expectations | The order may remain unfilled |
Fees | Depend on the platform | Depend on execution and platform rules |
Neither order type determines whether the asset is a suitable investment.
10. A Slippage Setting Does Not Guarantee a Good Trade
Some swap interfaces allow users to set a slippage tolerance.
This generally defines how much execution may deviate from the quoted outcome before the transaction fails, under that service’s rules.
It is different from an order-book limit order.
A higher tolerance permits a larger adverse deviation. A lower tolerance may cause execution to fail if conditions change.
For some blockchain transactions, a failed attempt can still incur network costs. Review the specific service’s documentation before using these settings.
What OptimCoins Users Should Review
Before using OptimCoins or another digital-asset platform, confirm how transactions are actually handled.
Ask:
- Are market and limit orders available?
- Does the service use an order book or provide a quoted conversion price?
- Is the displayed price indicative or executable?
- Which fees, spreads or markups apply?
- How are partial fills handled?
- What cancellation and expiry settings are available?
- Are there execution-protection limits?
- Where can completed trade records be downloaded?
This guide does not establish that OptimCoins provides every order type described.
The relevant features and rules should be confirmed through current platform documentation or support.
Common Mistakes Investors Should Avoid
Common misunderstandings include:
- Assuming a chart price is guaranteed.
- Entering the wrong trading pair or currency.
- Confusing an amount to spend with an asset quantity.
- Assuming a limit order must fill when the chart touches its price.
- Ignoring partial fills.
- Treating a sell limit as a stop-loss instruction.
- Assuming all limit orders receive maker fees.
- Increasing slippage tolerance without reviewing the consequences.
- Leaving outdated orders active.
- Overlooking transaction costs.
A chart reaching a limit price does not guarantee execution. Available quantity, queue position and the trading venue matter.
Check the Order Before Confirming
Review the complete instruction:
- Confirm the asset and trading pair.
- Check whether you are buying or selling.
- Verify the quantity or spending amount.
- Confirm the order type.
- Check any limit price.
- Review duration and execution settings.
- Read the fee and price information.
- Check existing open orders.
- Confirm the submitted order’s status.
- Save the final execution record.
These checks help reduce avoidable order-entry mistakes.
Understanding Orders Does Not Remove Investment Risk
Order types help control aspects of execution. They do not prevent an asset from losing value after purchase.
A correctly executed limit order can still result in an investment loss. A market order can execute efficiently while buying an unsuitable asset.
Moneysmart describes most crypto assets as high-risk investments. Understanding trading mechanics should sit alongside an assessment of your goals, financial circumstances and ability to absorb losses.
Making More Informed Crypto Trading Decisions
Market orders generally prioritise prompt execution, while limit orders set a price boundary. Slippage explains why an achieved price can differ from the price expected.
For investors using OptimCoins or another platform, reviewing liquidity, fees, order settings and execution records provides a clearer picture of each transaction.
This article provides general educational information and does not recommend a particular cryptocurrency or trading strategy.