Why does the final BTC amount I receive differ from the swap preview
The final BTC amount you receive differs from the swap preview because the preview shows an estimate based on market conditions at that moment, and those conditions change by the time your transaction confirms. Market price moves, network fees fluctuate, and the swap route may adjust during the interval between starting and completing the swap.
Swap crypto
Live rates · no accountSend exactly to:
This asset needs a memo / tag. Send it with or the exchanger cannot credit your deposit.
You receive about at . Exchange reference .
Status: waiting for your deposit
You send from your own wallet straight to the exchanger — nothing to connect, no account, and you stay on this page throughout. Rates are indicative until a swap is opened.
The swap is carried out by an independent exchanger and the deposit address above is theirs. cultel.xyz never holds, receives or controls your funds, has no key to that address, and earns a referral commission. Opening a swap sends your receiving address, IP, browser and timezone to the exchanger for their compliance checks; we store none of it. Check their terms, fees and country restrictions before sending anything.
When you request a swap preview, the platform takes a snapshot of current exchange rates, Bitcoin network fees, and the exchanger's liquidity. This snapshot is valid only for a few minutes. Your actual swap begins only after your Bitcoin deposit reaches enough confirmations. For Bitcoin, this typically means waiting for one or more block confirmations, which can take anywhere from a few minutes to over an hour, depending on network traffic and the fee you attached to your sending transaction.
Three main factors cause the final amount to drift from the preview.
Exchange rate movement. Bitcoin's price against other cryptocurrencies changes constantly. The preview locks a rate for a brief window - often as short as 60 seconds. If that window expires before your deposit confirms, the rate resets to whatever the market shows at that later time. Even small price swings of 0.5 - 1 percent can produce a noticeable difference in the BTC you eventually receive.
Network fee adjustments. The swap preview estimates the Bitcoin miner fee the exchanger will need to pay to forward your swapped funds. Bitcoin miner fees are not fixed; they are bids in a competitive auction for block space. If the mempool congestion changes between your preview request and the moment the exchanger broadcasts the outgoing transaction, the fee will differ. The exchanger aims to confirm the outgoing transaction in a reasonable time, so it adjusts fees to match prevailing conditions. That adjustment changes the net amount you receive.
Route changes and liquidity. The exchanger routes swaps through available liquidity pools. If a particular pool becomes depleted or its price shifts sharply before your swap executes, the route may switch to a different pool with a different effective rate. This is more common when swapping between less liquid pairs or during periods of high volatility. The preview cannot predict which exact pool will ultimately handle your swap.
What you can control. Use the swap preview only as a rough guide, not as a binding quote. To get a result closer to the preview, ensure your sending transaction carries a sufficient miner fee so it confirms quickly. A low fee delays confirmation, giving market conditions more time to change. The sibling page "What happens if I send Bitcoin with a low miner fee to a swap address" covers this in detail. Also, avoid swapping during periods of extreme market volatility or Bitcoin network congestion - both widen the gap between preview and final amount.
A genuine limitation. Bitcoin's settlement model is slower than many other chains. Swapping Bitcoin for other assets inevitably introduces a delay between rate lock and execution. This is not a flaw in the swap mechanism; it is a property of Bitcoin itself. The hub page "Swapping Bitcoin for other assets" explains how Bitcoin's proof-of-work confirmation time imposes a natural latency on any swap involving the network.
The honest takeaway. No preview is a guarantee. Treat it as an estimate that can move by a small fraction to a few percent. If the final amount differs by more than expected, the cause is almost always one of the three factors above. The exchanger does not profit from the difference - fees are passed through, and rates are sourced from external markets. The slippage is a mechanical consequence of swapping an asset that takes minutes to settle, not a hidden charge.
Not financial advice. cultel.xyz publishes market data and general information about digital assets. Crypto assets are volatile and you can lose everything you put in. Nothing here is a recommendation to buy, sell or hold, and we make no price predictions.
Prices are sourced from third parties and may be delayed or wrong. Verify anything you intend to act on against a primary source.