What a minimum does in a wallet swap

A swap minimum is the least amount of the new token your wallet will accept for a trade to complete. The wallet starts with a quote, applies your slippage tolerance to calculate a floor, then includes that floor in the transaction. If execution would deliver less, the swap should fail instead of completing at a worse rate.

Here is the sequence: you choose the tokens and amount; the wallet or its swap service estimates the output from available liquidity; you set or accept a tolerance; the transaction carries a minimum output to the contract. The contract checks the actual result against that floor. For a plain-language account of the cross-chain mechanism, read this explainer on how Chainflip handles native cross-chain swaps. A cross-chain route can involve extra execution steps, so check what the wallet says its minimum covers.

How does a wallet calculate the minimum?

The wallet usually turns a percentage tolerance into a token amount. If a quote estimates 100 units out and tolerance is 1%, the minimum is 99 units. That arithmetic is simple; the quote itself is an estimate based on the market and route when the wallet builds the transaction.

The minimum is a limit, not a promise that you will receive that amount. If the trade executes above the floor, you receive the actual output. If the market moves, a pool’s available liquidity changes, or another trade gets in first and pushes output below the floor, the contract rejects the swap. On many chains, that failed transaction still uses network fees.

What changes when you raise or lower the minimum?

Changing the slippage tolerance changes how far execution may move from the quote before the contract stops the trade. A tighter tolerance raises the minimum. It gives less room for a price change, but makes a failure more likely when the market moves or the route is thin. A looser tolerance lowers the minimum and makes execution easier, while allowing a worse result.

Think of the minimum as a floor under a moving quote: it defines how far the trade may fall before it is cancelled. It does not make the quote fixed or reserve liquidity. A displayed minimum is more useful than a tolerance alone because it states the smallest output in the token you will receive.

Before signing, check:

• The quoted output and the minimum output, in the destination token.
• Whether the route includes more than one swap or chain.
• Network fees, which can still be charged if a transaction fails.
• Any warning that the route needs unusually high slippage.

What should you set for a wallet swap?

For most readers, the better choice is the wallet’s normal setting unless the quote shows a reason to change it. A failed swap can be tried again after checking the route and current quote; a very low minimum can let a trade complete on terms you did not expect. Do not raise tolerance just to clear a warning without understanding why the wallet needs it.

If you do adjust it, compare the new minimum with the quoted amount before confirming. On a cross-chain swap, also check whether the minimum applies to the final destination amount or only to an intermediate step. The practical rule is simple: set a floor you can accept, then let the transaction fail if execution cannot meet it.