Swapping From Your Wallet: Set A Safe Slippage Limit

Use a tight slippage limit for a liquid, steady trade, then raise it only if the swap keeps failing and the token’s price still looks acceptable. Slippage is the amount your final result may differ from the quote. The limit sets the least you agree to receive before the swap cancels.

Your slippage limit sets a minimum output

A wallet swap quote is an estimate, not a guaranteed payout. Slippage tolerance is the allowed drop from that estimate while your transaction waits for the blockchain to process it.

Say a quote offers 1,000 USDC for 0.25 ETH. With a 0.5% tolerance, the transaction must deliver at least 0.24875 ETH. If it would deliver less, the swap reverts, meaning it is cancelled. You may still pay a network fee for the failed attempt.

This limit does not cap the effect your own trade has on the market. That effect is called price impact: a large order can move the price because available token supply is limited. Check the quoted output and any price impact warning before signing, even when the slippage setting looks small.

Choose a limit that fits the token and trade

For a small trade in a liquid token pair, start around 0.1% to 0.5%. These are examples, not guarantees; the right setting depends on price movement, available liquidity, and how quickly the transaction gets processed.

For a thinly traded token, the quote can change more before your swap completes. A wider limit may help it succeed, but it also allows a worse result. If the quote needs several percent of tolerance, check the token, trade size, and price impact before accepting that risk.

When ParaSwap compares routes across liquidity sources, the best route can still change before execution. Check the minimum received amount for the route you are about to sign; use that figure to judge the trade, rather than assuming the first quote is fixed.

Check the transaction before signing again

First, confirm the token names and network in your wallet. Then review the quoted output, minimum received, slippage setting, and network fee. The minimum received is the transaction’s lower bound: it turns your chosen tolerance into a number you can compare with the quote.

If the swap fails, get a fresh quote before retrying. Don’t keep widening the limit to force a trade through; the market or route may have changed. Uniswap’s developer documentation describes minimum-output checks and transaction deadlines as safeguards against a changed execution price. A deadline is the time after which the swap expires.

If the wallet asks you to approve a token, it is asking permission for a swap contract to spend that token. Ethereum’s ERC-20 standard defines this approval mechanism. Check which token and spending amount the wallet shows, then approve only what you intend to trade if that option is available.

For your next swap, start with a fresh quote and a tight limit, then compare the displayed minimum with the amount you are willing to accept. Sign only when both the trade and its possible fee make sense to you.