Why destination gas changes a bridge payout

A bridge payout can arrive intact yet remain unusable for a follow-up transaction if the receiving wallet has no gas on the destination chain. Bungee’s API documentation describes an optional “bridgeWithGas” flag for including a refuel that delivers native tokens on the destination chain.

The payout’s token amount is only part of the result: destination gas determines whether you can act on those funds immediately.

That distinction matters when comparing routes. The destination asset and the chain’s native gas token are separate balances, even if a route can deliver both in one transfer. For the trade-offs between available paths, see how to choose a Bungee bridge route. A route’s quoted output, estimated time and required steps all affect what you can do after it completes.

What does a destination gas buffer cover?

A destination gas buffer is a small balance of the chain’s native token reserved for transactions after the bridge payout. On an EVM chain, that token pays the network fee for actions such as sending an ERC-20 token or swapping it. The payout can therefore be successful while the wallet remains unable to move the received asset.

The buffer is not a fixed universal amount. Its useful size depends on the destination chain, the transaction you plan to make and the gas conditions when you make it. A wallet that only needs to send once may need less than one that intends to approve a token and then swap it. Treat the buffer as working capital for the next step, rather than a percentage of the bridged amount.

How does refuel change the payout?

Refuel adds destination gas to the transfer when the route supports it, so the recipient can make a subsequent transaction without first arranging a separate gas transfer. Bungee’s API documents the option as a request to “drop” native tokens on the destination chain alongside the bridge route. Availability and terms depend on the route; check the quote and transaction details before signing.

Because refuel uses value from the transfer or adds a route cost, compare the net result rather than treating the gas delivery as free. A route that delivers slightly less of the requested token may still be more useful if it also leaves enough gas for the action you need. Conversely, if the receiving wallet already has gas, paying for another top-up can reduce the payout without helping.

When should you keep gas in the wallet?

Keep a separate gas buffer on chains where you regularly receive assets and need to move them promptly. This avoids relying on refuel support for every route and keeps the bridge transfer focused on the requested token. For an occasional destination or a wallet with no gas balance, refuel can consolidate the transfer and first transaction into a more practical arrival.

• Check the destination chain’s gas token; it may differ from the asset being bridged.
• Estimate the next action, including any token approval as well as the send or swap.
• Compare the quoted destination amount with and without gas delivery when both routes are offered.
• Leave a reserve if you expect to use the wallet again; spending the full gas balance can recreate the same constraint.

The useful comparison is not simply which route pays out the most tokens. It is which route leaves the right destination asset and enough gas for the next action, at a total cost you accept. For regular transfers, maintaining a modest destination reserve gives more control; for a one-off transfer, a supported refuel option can make the payout usable sooner.