The market screen shows one price, but your order's average fill is different. That does not necessarily mean an extra fee was charged. Your order may have been filled in parts at different prices. Separate your intended price from the prices actually available.
The order book contains quantities at different prices
The last traded price describes a previous execution, not a promise to fill your whole next order there. Available quantity and changing offers affect the result.
Do not attribute the entire difference between a price screenshot and your debit to fees. Quantity, price changes, partial fills and explicit charges belong in separate parts of the calculation.
Also check which side of the book you are reading. The last trade, best bid and best ask are different observations. Buying needs a seller; selling needs a buyer. A screenshot of the last price cannot establish whether your whole quantity was available at that price.
In the example above, 30.1 is the trade value. The extra 0.1 compared with buying everything at the first level is not itself a platform fee. Check any separately listed fee separately.
A market order uses the offers available at execution
What it buys you is execution; the price comes from the market at that moment.
It prioritizes trading against available liquidity rather than a single price you specify. Liquidity, volatility, size and platform rules still matter, so immediate and complete execution is not guaranteed. Binance Academy's market-order explanation describes that mechanism.
Read the pair, buy or sell direction and input unit. A box asking for asset quantity and one asking for the amount to spend mean different things. The estimate before confirmation may differ from the eventual fills.
Read the unit beside the input
At a hypothetical price of 10 USDT per asset, entering a quantity of 20 means 20 assets. Entering an amount of 20 USDT describes a purchase budget of about 20 USDT. Those inputs have different meanings even if the boxes look alike.
The real form also applies precision, minimum-order and balance rules. If it rejects the order, identify the affected asset and requirement; adding a zero to make the error disappear is a poor way to choose an order size.
A limit controls the price boundary, not whether it fills
A buy limit sets the highest acceptable purchase price; a sell limit sets the lowest acceptable sale price. A lack of matching offers, queue priority or insufficient quantity can leave an order waiting or partially filled.
Successful submission is not successful execution. Inspect filled and remaining quantity when an open order reserves balance. Cancelling the unfilled portion can race with execution; read the final record rather than assuming the cancel click prevented every fill. See the limit-order guide.
A buy limit does not cap how far the asset can fall after purchase. It also is not simply a price alert: a marketable limit may execute immediately. Conditional orders have separate trigger rules.
What remains after cancelling a partial fill?
Suppose an order requests 5 units, 2 have filled and 3 remain. Cancellation concerns the unfilled part. The 2 purchased units do not automatically sell back.
| Record | Meaning |
|---|---|
| Requested 5; filled 2 | Plan around the 2 acquired units, not all 5 |
| Cancellation requested | Read the final result; matching may occur meanwhile |
| Cancelled; filled quantity still 2 | Keep those fills and fees; the rest is no longer open |
This fixed-quantity illustration is not a real trade. Selling the acquired position is another decision at another available price, not an undo command.
Maker and taker describe how liquidity is used
A limit order priced to match existing offers can take liquidity. “Limit” therefore does not guarantee maker fees. The Binance Academy maker-and-taker guide explains this case. Read the current product fee schedule and actual fills. Special options such as post-only have their own execution or cancellation behavior; do not enable them merely for their name.
If an order fills in pieces, reconcile each piece's quantity, price and charge. Unfilled quantity is not a completed trade. The fee guide separates these costs from withdrawals and gas.
Before choosing an order type, ask whether you can accept no fill and whether you need a price condition. A limit expresses a price you will accept; a market order emphasizes execution against available quotes. Neither decides whether the asset is worth buying.
A limit farther from the market trades the prospect of a better price for waiting, possibly indefinitely. If a payment or withdrawal depends on the purchase, use the acquired balance for planning rather than an order that is still open.
The number worth copying out of the record is the average fill price, not the price on screen when you submitted. Reconciling, costing and comparing fees all run on that figure.
Read the execution record before explaining a balance change
Check submitted quantity, executed quantity, average price, remaining order, fee asset and fee amount. Reserved funds and paid costs are different. If an order is rejected, read minimum-size, precision or balance notices instead of assuming a connection problem or adding a zero to the amount.
When the numbers still differ, keep the order reference and the relevant fills for official support. An intended order value alone cannot explain what actually executed.