A cross-chain swap quote estimates how much of a different asset you will receive after a route moves value between blockchains. Read its expected output, minimum output, route and network costs before signing: those figures show what the swap aims to deliver, what price movement it can tolerate and which transaction costs you may need to pay.
A quote separates the expected output from the minimum
The expected output is the route’s estimate at the time you request it; the minimum output is the least you have agreed to accept if prices move before the swap completes. For example, if a quote estimates 0.34 ETH and you set 2% slippage tolerance, the minimum would be about 0.3332 ETH, before any fees the quote accounts for separately.
Slippage tolerance is a limit, not a fee or a promise that you will receive the full estimate. Set it too tight and a normal price move can make the swap fail; set it too loose and you allow a worse exchange rate. When comparing thor swap routes, look at the minimum you could receive as well as the headline estimate.
The route explains how value gets across chains
A cross-chain route can involve a swap on the source chain, a transfer or settlement between chains, and another swap on the destination chain. It may use intermediate assets or liquidity pools, so the path can be longer than “send this coin, receive that coin.” The execution details matter when you are deciding how thor swap executes cross-chain swaps, but the quote is where you check what that means for your own transaction.
Each chain has its own assets and transaction rules. For an ERC-20 token, the wallet may first ask you to approve a contract to use the token; native assets such as ETH do not need that token approval. Approval and swap are separate transactions, and the approval does not itself move the funds across chains.
Network costs and price impact affect the result
Network fees pay for transactions on blockchains, while price impact comes from trading against available liquidity. A route may require gas on the source chain, and a destination transaction can also require gas depending on how the swap is structured. The quote may show some costs as deductions from the output or require you to hold the chain’s native gas token separately.
For example, a large trade against a shallow pool can move the market price even if the network fee is small. That price impact is different from slippage: impact comes from the trade’s size relative to liquidity, while slippage is the change between the quoted and executed price. Compare the net output after listed costs, not just a displayed fee or exchange rate.
At thorswap.us, you would use the service to move and swap an asset between chains in one flow; first check that the quote’s source asset, destination asset and minimum output match your plan.
Check the wallet and destination before signing
Your wallet is the source of funds and the place where you authorize transactions. Check that it is connected to the chain holding the asset, that you have enough balance for the swap and any required gas, and that the destination asset is one you can receive and use. A token with the same ticker can exist on multiple chains, so verify the network as well as the symbol.
A common mistake is to treat the quote like a centralised exchange order and assume the platform will sort out the wallet details. In self-custody, the wallet signs the source-chain transaction, and an incorrect network, token approval or destination can stop the swap or leave you with an asset you did not mean to hold. Review each wallet prompt against the quote before approving it.
If the minimum output is acceptable and the source and destination details are right, sign the transaction and keep its status visible until the route finishes. My practical tip: start with a smaller amount when using an unfamiliar route, then compare the actual received amount with the quote before moving more.
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