Your Wallet Swap Quote Changed: Set Slippage Safely

A 1% slippage limit means accepting at least 99% of the quoted token amount. Use the smallest limit that allows for normal price movement while your swap is being confirmed.

What Do Price Impact And Slippage Mean?

Price impact is the change your trade causes in a pool’s price. A pool is a shared store of two tokens that traders swap between. Larger trades and shallower pools usually cause more price impact.

For example, imagine a pool holds 50,000 units of each token, and you trade 500 units of one token. In a simple pool model, the trade moves the price by about 1% before fees. That estimate is illustrative; actual pools may use different designs.

Slippage is the difference between the amount shown in your quote and the amount available when the swap runs. The quoted amount already reflects estimated price impact. Slippage tolerance sets the extra amount of change you will accept while the transaction waits.

For an Avalanche C-Chain example, Avalanche Blackhole swap is a decentralized exchange where people swap tokens from their own wallets. The same price impact and slippage ideas apply when you use Blackhole swap or another exchange on Avalanche.

How Do You Choose A Slippage Limit?

Start with the minimum amount you would accept, not a familiar setting from a centralised exchange. If a wallet quotes 100 tokens and you set 1% slippage, the swap can proceed only if it returns at least 99 tokens.

Check the quote’s price impact first. If the trade already loses 4% against the pool’s current price, raising slippage does not undo that loss; it only permits a further price change before execution. Consider a smaller trade or a deeper pool if the impact seems too high.

Then consider how much the price could move before confirmation. A steady, liquid pair may need only a small buffer. A thinly traded or fast-moving pair may need more, but there is no universal safe percentage. The right amount depends on the pair, trade size, and current activity.

For a worked example, your wallet quotes 100 tokens at a 1% price impact. With 1% slippage, the minimum is 99 tokens. If the available amount falls to 98.8 before execution, the swap should fail that limit; at 2%, the minimum is 98 tokens, so it could proceed at 98.8.

What Happens If The Swap Fails?

A failed swap means the transaction did not meet its conditions, such as the minimum amount you set. Your tokens should remain in your wallet, but the network can still charge a fee for processing the attempt. On Avalanche C-Chain, this fee is paid in AVAX and varies with network conditions and the transaction.

There is one safety check worth making before you increase the limit: confirm the token and quote are still the ones you intended. A high limit gives the swap room to complete at a worse price; it does not promise the quoted amount. If the quote has changed sharply, pause and check the pool and trade size.

Before you confirm, check:

• The token names and amounts match your intention.
• Price impact looks reasonable for your trade size.
• The minimum amount reflects the most you are willing to accept.
• You have AVAX available for the network fee.