Crypto bridge fees vary by token and direction

Crypto bridge fees depend on the token, route and direction, so the asset you move may not be the currency that pays the transaction cost. Separate network gas from any bridge or swap fee, then compare the net amount shown for the destination before signing.

Which currency pays the bridge fee?

Network gas is paid in the source chain’s native currency for the transaction that starts the transfer. An ERC-20 deposit from Ethereum, for example, usually needs ETH for gas even when the token being bridged is a stablecoin.

A bridge may also charge a service fee in the token being moved, deduct it from the transfer, or include it in a quoted exchange rate. Check the quote and wallet prompt separately: an approval transaction for a token can cost gas before the deposit itself, and approval does not move the asset.

For practical detail on choosing a route and timing, read this guide to planning Manta Bridge deposits and withdrawals. The same distinction applies elsewhere: gas belongs to a network transaction, while a bridge or swap charge belongs to the route.

Why do fees change by direction?

A deposit and a withdrawal use different transactions on different chains, so their gas costs can differ even when they move the same token. On a rollup’s canonical bridge, a withdrawal may also require a later claim on Ethereum; that step needs ETH and happens after the withdrawal becomes eligible to complete.

Fast liquidity routes can work differently: a provider may fill the destination transfer using its own liquidity, with a service charge or price spread reflected in the quote. Compare routes by what arrives, not by a fee label alone.

How should you compare a bridge quote?

Use the final received amount and identify what each quoted cost covers. Before confirming, check:

• Source and destination networks, including the selected direction.
• The token contract and amount expected on arrival.
• Gas currency and any separate approval or claim transaction.
• Service fees, exchange rate and estimated net amount received.

Small transfers can be disproportionately affected by fixed transaction costs; combining planned transfers may reduce the gas cost per unit, but leaves more value in transit at once. Manta Bridge is one example where the source and return legs should be considered separately.

After submission, the source transaction must confirm before the destination credit or any later claim can complete. The exact final cost and arrival time remain unconfirmed until the transaction is included and the route finishes processing.