If you swap only a few times a year, set slippage from the quote and the token’s volatility: use a low tolerance for a deep, steady pool and raise it only when a justified trade keeps reverting. For a Blackhole swap, read the quoted output and minimum received together; Blackhole swap fees can help you understand one part of the total cost, while slippage is about how much the execution price may move.
Slippage tolerance limits movement after the quote
Slippage tolerance is the maximum shortfall from the quoted output that the swap will accept when it executes. For an exact-input swap, the transaction sets a minimum amount you must receive; if the actual output falls below it, the swap reverts instead of completing at a worse price.
That limit protects you from changes while the transaction is waiting to be included in a block. It does not promise the quoted amount, and it does not cap every cost: a pool fee is charged as part of trading, and Avalanche gas is paid separately in AVAX.
Price impact is already reflected in the quote
Price impact is the effect your own order has on the pool as it trades; slippage is the change between the quote and execution. A large order against shallow liquidity can have high price impact before you submit it, even if the price does not move again while the transaction is pending.
Many Avalanche DEX pools use concentrated liquidity: providers place liquidity within selected price ranges, and the active liquidity can change as a swap crosses price ticks. That means the displayed pool balance alone may not tell you how much liquidity is available along the whole route. A thin or newly opened Genesis Pool can give a small trade a much larger price impact than a mature, heavily traded pair.
Use the minimum received to compare settings
Here is an illustrative example: a quote estimates that 1,000 USDC will return 500 tokens. With 0.5% tolerance, minimum received is 497.5 tokens; with 1%, it is 495. A wider tolerance gives the transaction more room to execute, but also allows a worse result before it reverts.
The quote’s 500-token estimate already reflects the pool’s current price impact and trading fee. The minimum received is calculated from that estimate, so do not treat tolerance as a fee or as a way to improve a poor quote. If the quoted output is unexpectedly low, inspect the route and pool depth first; increasing tolerance will not fix the underlying price impact.
As a practical starting point, a liquid pair in calm conditions may work with 0.1–0.5% tolerance, while a volatile or thinly traded token may need more. These are illustrative settings, not a guarantee: volatility, route length, liquidity and the time your transaction waits all affect the result. On Blackhole swap, compare the quote’s price impact and minimum received before deciding whether a higher setting is justified.
Reverts and poor quotes call for different actions
If the swap reverts because output fell below the minimum, refresh the quote and check whether the market moved; retrying with a slightly higher tolerance can make sense if the price change is acceptable. If the displayed price impact is already too high, reduce the trade size or wait for more liquidity rather than loosening the limit.
One edge case is a token with a transfer tax or unusual transfer rules: the amount received can differ from a normal pool estimate, and a standard tolerance adjustment may not solve it. Before swapping an unfamiliar asset, check its contract and whether the pool has recent, genuine trading activity. Keep enough AVAX in the wallet for gas, including if a transaction fails.
Choose the lowest tolerance that lets a fresh, acceptable quote execute; if that requires accepting a worse minimum than you are willing to receive, wait or reduce the trade.