Why two swap sites give different totals for the same pair and amount

05 September 2026

Two swap sites give different totals for the same pair and amount because each site uses a different source of liquidity, applies its own fee structure, and updates its price feed at a slightly different moment. The quoted amount you see is never a universal truth - it is a snapshot of one specific market maker’s inventory, adjusted by that site’s margin.

The core reason is that no two swap services access the same pool of tokens. One site might route your trade through a centralized liquidity provider that quotes a fixed price for a few seconds. Another might pull from a decentralized exchange where the price shifts with every trade in the pool. The spread - the difference between the market price and the price you actually get - varies between these sources. A site with a thinner spread will show a higher total. A site with a wider spread will show a lower one.

Fees compound the difference. Every swap site charges something, but they do not all charge the same thing. One might embed its fee entirely in the exchange rate, showing you a net amount after a 0.5% cut. Another might break out a separate service fee and show a higher gross amount before deducting that fee. The result is that the same 1,000 USDT swapped for ETH can appear as 0.32 ETH on one site and 0.31 ETH on another, even when the underlying market price is identical at that instant.

Network fees also distort the total. Some swap sites estimate the network fee and subtract it from the quoted amount. Others show the swap total before network fees and add the fee later. If a site underestimates the network cost, its quoted total will be higher than reality. If it overestimates, the total will look lower. This matters most on congested blockchains where fees fluctuate by the block.

Timing is the invisible variable. When you load two swap sites side by side, their price feeds are not synchronized. One might have fetched a price 0.4 seconds ago; the other might fetch one right now. In volatile markets, 0.4 seconds can mean a visible difference in the displayed total. This is not a bug - it is how real-time pricing works.

Liquidity depth matters too. A swap site that draws from a shallow pool will quote a worse rate for large amounts because the price impact is higher. A site with deeper liquidity may give you a total closer to the spot price. The same pair and same amount can yield different results simply because one site has more of the token available to fill your order.

Finally, some swap sites manipulate the displayed total to appear competitive. They show a high estimate to attract your click, then deliver less when the trade settles. Others deliberately quote conservatively to avoid refunding you later. This gap between quoted and received is a separate topic, but it contributes to the initial difference you see between sites.

To understand which swap site is actually cheaper, you need to look beyond the headline total. The hub page "What a crypto swap actually costs" explains how to break down the spread, the network fees, and the hidden slippage that produces those numbers. Without that breakdown, two different totals are just two different guesses.

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