Why does my received amount differ from the quoted amount in a swap

05 September 2026

You receive less than the quoted amount because the quote reflects the market price at the moment you initiate the swap, while the actual execution price may change by the time the transaction settles. Several real-world factors intervene between the quote you see and the crypto that lands in your wallet.

Price slippage

The most common reason is slippage. A quote is a snapshot of the current order-book depth. When you swap a token, the exchange must fill your order from available liquidity. If your trade is large relative to the liquidity at that price level, the exchange moves to progressively worse prices to complete the swap. The result is a less favourable average price than the one originally quoted. Slippage is not a hidden fee. It is a structural consequence of finite liquidity.

Quoted amounts typically assume zero slippage or a very small slippage tolerance. Most interfaces let you set a maximum slippage percentage (commonly 0.5% to 3%). If your swap exceeds that tolerance, the transaction fails entirely. If it stays within the tolerance, you still absorb the slippage up to that limit.

Network fees and gas

Network fees are deducted separately from the swap amount, but they can affect what you ultimately receive in a subtler way. On blockchains that use a gas mechanism, a high-priority transaction pays more to miners or validators. That fee is taken from the native token (ETH, BNB, SOL, etc.) in your wallet, not from the tokens you are swapping. However, if your wallet does not hold enough of the native token to cover gas, the swap cannot execute. Some interfaces will show an adjusted quote that accounts for the gas cost in the output token, reducing the amount you see.

The quoted amount typically ignores gas. It shows the pure swap output at the moment. After execution, the network fee is paid, and your received amount is the swap output minus any gas that the interface absorbed into the quote. This is more common on aggregators that estimate total cost in the output token.

Spread and the hidden cost

The hub page "What a crypto swap actually costs" covers this in detail, but the basic mechanism is worth noting here. Every swap has a spread: the difference between the buy and sell price of the asset pair. Liquidity providers and exchanges build a profit margin into that spread. When you see a quoted amount, it already reflects that spread. The received amount matches the quoted amount only if the spread does not widen between quote and execution. In volatile markets, spreads widen quickly. A quote that was valid a few seconds ago becomes stale. The received amount then reflects the new, wider spread.

Transaction finality and block time

On some blockchains, a swap may take multiple blocks to confirm. During that window, the price can move. The quoted amount is usually based on the most recent block's price. By the time your transaction is included, the price may have changed. This is not slippage in the strict sense - it is market movement during latency. The difference can be positive or negative, but it is almost never zero.

Aggregator routing

If you use a swap aggregator, the quoted amount is the best route it found at that instant. When the transaction actually executes, the route may no longer be optimal. Liquidity pools can shift, or a different pool may offer a slightly worse rate by the time the transaction lands. The aggregator will still execute the best available route at execution time, which may differ from the quoted route.

What you can do

Set a realistic slippage tolerance. For large trades on thin liquidity, tolerance may need to be higher. For small trades on deep pools, 0.5% is usually enough. Check that your wallet has enough native token for gas. Do not rely on the quoted amount as a guarantee. It is an estimate valid for a brief window. Treat any quote as approximate, and expect the received amount to differ by at least the network fee and some slippage.

The difference is not always a hidden cost. It is the cost of moving from a frozen quote to a live market.

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