How to Estimate Your Cross-Chain Swap Output From a Wallet

Compare the destination amount with the costs taken from your starting balance. A wallet-to-wallet cross-chain swap can change both the network and the asset, so the amount you send may not match the amount that arrives.

What does a quote tell you?

A quote estimates how much of the destination asset a route can deliver for your chosen input. The route is the path a swap takes between networks; depending on the service, it may use liquidity on one or more networks.

In general, a bridge moves value across networks by locking or supplying an asset on one side and releasing or providing value on the other. A swap also exchanges one asset for another, so its output can change with the exchange rate and available liquidity. acrossbridge crypto lets readers move and swap assets across networks in one flow when that is the task they need to complete.

How do you work out the likely amount?

1. Write down your full input. Note the asset, network, and amount in your wallet. Also check that you have enough of the network’s fee token, the asset used to pay for transactions, because that cost may be separate from the swap amount.
2. Read the quoted destination amount. If you enter 100 units and the quote shows 98.7 units of a different asset, 98.7 is the estimated delivery before any separately charged destination cost. Do not compare the two amounts as if they were the same asset; compare their value using the displayed exchange rate.
3. Separate the price effect from network costs. The price effect includes the exchange rate and price impact, which is the change caused when your trade uses available liquidity. Network fees pay for transactions to be processed. Ethereum.org’s gas documentation explains that Ethereum transaction fees depend on the gas used and the network’s base fee and priority fee.
4. Redo the estimate with your own numbers. Suppose your wallet has 100 units, the service quotes 98.7 destination units, and the source transaction costs the equivalent of 0.4 input units. Your rough net value is the value of 98.7 destination units minus the value of 0.4 input units. Keep currencies separate until you convert them using the same reference price.
5. Check what could change before signing. Compare the quote with your intended destination network and asset, then review the minimum output if one is shown. A quote is an estimate: prices and available liquidity can move while the source transaction waits for confirmation. If the estimate changes sharply, pause and check the new numbers.

What should you do before sending?

Use the quoted destination amount to decide whether the trade is worthwhile, then keep enough fee token for the source transaction. For a first transfer, a small test amount can show how the route behaves before you move a larger balance; remember that the network fee may make a tiny test less cost-effective.