Set Slippage Before an Avalanche Swap

Avalanche C-Chain traders set slippage tolerance before submitting a swap to cap how far execution can move from the quote. Core Support describes the setting as a limit on the difference between the expected and executed price; it also offers an auto-slippage option that selects a tolerance for the swap.

For the separate choice between a direct trade and a pool route, see this guide to choosing a Blackhole trade or pool. The tolerance setting controls the minimum output the transaction will accept, not the quality of the route or the token.

What does slippage tolerance change?

Slippage tolerance sets the worst output your transaction will accept compared with its quote. For a quote of 1,000 tokens, a 0.5% tolerance means the swap should revert if execution would return less than 995 tokens.

Core Support says a higher tolerance makes execution more likely when prices move quickly. The trade-off is that the transaction can complete at a worse rate; a lower limit protects the minimum output but can cause a swap to fail if the market moves before confirmation.

How should you choose a slippage setting?

Start with the quoted output and inspect the trade size, price impact and pool depth before changing the tolerance. The European Securities and Markets Authority describes slippage as the difference between a swap’s effective rate and the pre-swap spot rate; in a pool, a larger trade relative to available liquidity can move that rate.

• Use the platform’s default or auto setting as a starting point, then check the displayed minimum output.
• For a liquid pair and modest trade, keep the tolerance tight; widen it only if a reasonable trade repeatedly fails.
• For a thin pool or volatile token, compare a smaller trade’s quote and price impact before accepting a wider limit.
• Check the token contracts and route, and keep AVAX available for C-Chain transaction fees, as Avalanche Support advises.

When should you cancel a swap?

Cancel or re-quote if the displayed output changes sharply, price impact is high, or the route uses an unexpected token. Raising tolerance does not add liquidity or improve the price; it only allows execution at a lower output than the original quote.

After you submit, the transaction’s final output remains unconfirmed until it executes on-chain. Avalanche Support says DEX swaps cannot be reversed, so check the minimum output and transaction details before signing; the actual fill and confirmation time remain unknown until execution.