Do You Need Gas on Both Chains to Bridge Crypto?

Do you need gas on both chains to bridge crypto? You always need enough of the source chain’s native token to submit the transfer, but you may not need destination gas if a relayer completes the claim for you. The answer depends on the bridge’s settlement method, not just the token you’re moving.

Why do you need gas on the source chain?

The source transaction is an onchain instruction, so the source network charges its usual transaction fee. Depending on the bridge, that transaction may lock your tokens in a contract, burn them, or send them into a liquidity pool. The bridge fee, if any, is separate from this network gas: paying one does not necessarily cover the other.

After the source transaction, some bridges wait for an attestation or message before the transfer can finish on the destination. A step-by-step account of a Wormhole bridge transfer and recovery can help explain that intermediate stage. Whether you pay destination gas comes down to who submits the final transaction.

When do you need gas on the destination chain?

If the transfer uses manual settlement, you generally need the destination chain’s native token to submit the claim or redemption transaction. The bridge may have verified the source transfer and prepared the destination asset, but those steps do not themselves execute the destination contract call. Until that call succeeds, the funds may remain unclaimed.

With an automatic route, a relayer submits that call and pays the destination transaction fee. The route may charge you through a quoted fee or deduct a portion of the transferred amount, so “no destination gas needed” does not mean the service is free. Some routes also offer gas drop-off, converting part of the transfer into the destination chain’s native token for later transactions.

What should you check before bridging?

Check the route’s settlement type and quote before approving the source transaction. In particular, look for whether the destination claim is automatic, whether the displayed fee includes relaying, and whether any gas drop-off is optional or deducted from your output. A bridge can deliver the asset without leaving you able to spend it if you have no destination gas.

• For a manual claim, keep native gas on the destination chain.
• For an automatic route, check the relayer fee and delivery conditions.
• If you need to transact after arrival, account for destination gas even when the bridge covers the claim.

The practical rule is simple: budget source gas every time, then budget destination gas unless the route clearly handles redemption. Before you confirm, watch the quote’s destination gas amount and the route label showing who submits the final transaction.