Slippage tolerance sets the price limit on a volatile swap

Slippage tolerance sets how much a swap’s execution price can move from its quote before the trade fails. For volatile token pairs, a wider limit can help a trade go through, but it also allows you to receive less of the token than the quote showed.

What does slippage tolerance control?

A swap quote is an estimate; the final amount depends on the price when the trade executes. Slippage tolerance sets a limit on how much that amount can change. If the result falls outside the limit, the swap usually reverts, meaning it does not complete, though you may still pay a network fee.

For example, if a quote offers 100 units of a token and your tolerance is 1%, the swap may accept an output as low as about 99 units. The limit is based on the quoted output, not a promise that the price will stay still. Fees or token rules can also affect what arrives in your wallet.

The linked guide explains Blackhole’s Avalanche swap options and why checking the network matters. Confirm you have selected the network your tokens are on before you approve a trade.

Why do volatile pairs need more care?

When prices move quickly, the quote can change between the time you submit a swap and the time it executes. A tight tolerance may cause more trades to fail during that movement. Raising the limit can help a trade complete, but it raises the worst price you are agreeing to accept.

That trade-off matters more when a pair has little trading activity or a large order would move its price. A swap can execute at a worse rate than expected even when it stays within your limit. Tolerance is a ceiling on acceptable change, not a way to improve the price.

How should you choose a tolerance?

Use the smallest limit that is likely to let the trade complete at the current market conditions. Start with the setting shown by the swap interface, and only widen it if a trade fails and you understand why. A failed swap can be frustrating, but automatically raising the limit may expose you to a worse fill.

• Check the quoted output and the minimum output before approving.
• For a large order, consider splitting it into smaller swaps; each may have less effect on the price, though it may mean paying network fees more than once.
• If the quote changes sharply or the trade keeps failing, pause and get a fresh quote instead of raising the limit repeatedly.
• Check the token addresses and network, especially when token names look alike.

For most readers, a modest tolerance is the better starting point. Widen it only when the trade’s likely price movement justifies accepting a lower minimum output. If that minimum is too low, wait or reduce the order.