How to Set Slippage for a Wallet Token Swap

How to Set Slippage for a Wallet Token Swap

Start with a low slippage limit, then raise it only if a sensible swap keeps failing. Slippage tolerance is the largest gap you’ll accept between the amount shown before trading and the amount your wallet receives; checking that minimum helps you decide whether the trade is still worth making.

  • Price impact comes from your trade changing the pool’s price; slippage comes from the quote changing before execution.
  • A wider limit can help a trade complete, but permits a worse minimum return.
  • Check the minimum output and keep network-fee funds in your wallet before confirming.

What does slippage tolerance protect?

Slippage tolerance sets a floor on the tokens you’ll receive. A decentralized exchange, or DEX, uses this limit when it sends your swap to the blockchain. If the available amount falls below your floor before the swap executes, the transaction reverts, meaning the swap does not complete.

That floor does not remove price impact. Price impact is the effect your own order has on a pool’s price; it tends to be larger when your order is large compared with the pool’s available liquidity. Slippage is the later change between your quote and execution, caused by other trades or price movement while your transaction waits.

For example, suppose a quote shows 100 USDC for 98.5 ABC tokens. With a 0.5% tolerance, your minimum is about 98.01 ABC: 98.5 multiplied by 0.995. If execution would deliver less, the swap should fail instead of accepting that lower amount.

Choose a limit from the quote

Pick a limit that fits the pair and the amount, rather than using a large number to force every trade through. A deep pool and a quiet market may need little tolerance; a thin pool or fast-moving token can need more. A large price-impact estimate is a reason to reconsider the trade size, not simply widen the limit.

  1. Check the token pair and the quoted output. Make sure the token names and amounts match what you intend to trade.
  2. Read the price impact, if shown. This estimates the price change caused by your trade itself, so compare it with the benefit of splitting a large order.
  3. Set a modest slippage tolerance. If the swap fails, check whether the market moved or the pool is thin before increasing it slightly.
  4. Review the minimum output, then confirm only if you would accept that amount. Keep enough of the network’s native token to pay the transaction fee; the fee may still apply if the swap reverts.

Know when to wait or reduce the trade

A wider limit trades a better chance of execution for a worse possible outcome. If a token price moves sharply, a swap could execute near its minimum and still be a poor deal. If the quote changes repeatedly, wait for conditions to settle or reduce the amount and check again.

On BaseSwap, the same decision applies when swapping against available liquidity: the minimum output is the key figure to judge. For more on supplying tokens to pools on Base, see the BaseSwap liquidity pools. Before acting, ask yourself: would I still make this swap at the minimum shown?

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