Keep Gas Ready for Both Sides of a Cross-Chain Swap

Keep enough of each chain’s native gas token to pay for the swap and any transaction you plan to make after it. A cross-chain route can charge gas on the source network while leaving the destination wallet without the token needed to use its new assets.

Gas pays for transaction processing, and each network sets its own fee rules. A token’s ticker or a similar name does not make it usable for gas on another chain.

Which gas tokens does a cross-chain swap need?

Most routes need a native gas token on the source chain to start the transaction. The destination may need its own native token for a later transfer, approval or swap.

Check the route’s fee breakdown and the wallet balance on both networks before signing. A route involving a manta bridge may have its own handling for destination execution and fees; the manta bridge guide explains the integration choices in more detail.

How much gas should you keep aside?

Start with the route’s estimate for the source transaction, then leave a margin for fees changing before confirmation. Keep a separate amount on the destination chain if you expect to move or trade the received tokens.

There is no useful universal reserve. Fees depend on the network, congestion and transaction complexity. A simple transfer usually costs less gas than a contract call, such as a token approval or decentralized exchange trade.

• Check the wallet’s native-token balance on the source chain.
• Read the quote for source gas, bridge or relayer fees, and any destination gas provision.
• Keep destination native tokens if you will transact there after the swap.
• Confirm the network shown in the wallet before approving each transaction.

Can the swap provide destination gas?

Some routes or wallets offer a destination gas drop, or let a relayer pay for destination execution. That can remove the need to fund the destination wallet beforehand, but availability and fees depend on the route.

Check whether the quote includes this service and how it affects the amount delivered. If the swap sends only the requested token, that token may not cover gas, even if it is valuable or widely used.

The practical rule is simple: budget for the source transaction, then verify whether the destination side is funded by the route or by your own wallet. Treat those as separate costs before you sign.