What affects the cost
Gas is the resource used to pay for computation and transactions on a blockchain. In a bridge transaction, the source-chain wallet generally needs the network's native gas asset to submit the required transaction.
ONESWAP LEARN
What Is Gas When Bridging Crypto?.
Understand blockchain gas and why the source network's fee matters in cross-chain transfers.
Why the quote changes
Token balances do not necessarily cover gas. For example, holding a stablecoin on a network does not mean you can pay the network fee unless you also have the required native asset.
What to compare
Gas prices can move with network demand, which changes the cost of a route. Some destination costs may also appear depending on the bridge design.
Practical takeaway
Before signing, confirm the wallet has enough native gas for the route's required source transactions. Review the quote because the exact number of transactions can vary.