If you are used to a centralised exchange, your wallet can receive less after a Mantle bridge because the route may convert the asset and charge costs at different stages. The amount shown as “you receive” is not always the same as the total value leaving your wallet.
Four figures explain the difference
- Amount sent: the token amount you choose to bridge or swap.
- Estimated output: the destination amount predicted by the route.
- Network gas: the cost of processing transactions on a blockchain.
- Minimum received: the smallest destination amount allowed before a swap fails.
Amount sent is the input to the route, not necessarily the amount that arrives. If you send one token and receive the same token, compare the source and destination token balances, and check whether the route lists a bridge charge.
Estimated output reflects the route’s expected result. If you choose a different destination asset, the exchange rate affects the amount just as it would in a normal swap.
Network gas pays for transactions, usually from a separate balance of the source network’s native token. An ERC-20 transfer may also require an approval transaction first, which can cost gas without moving the tokens themselves.
Minimum received is a protection used by many swap routes. If the market moves too far before execution, the swap may fail rather than deliver less than that threshold.
The transfer can contain more than one transaction
A wallet transfer is not a centralised exchange ledger entry: it is a chain of public transactions and messages. The source transaction authorises or sends the asset, a bridge or liquidity route handles the cross-chain leg, and a destination transaction may deliver the asset or complete a swap.
On an Ethereum-to-Mantle route, for example, a direct deposit may move a supported token into a bridge contract on Ethereum and release its corresponding representation on Mantle. A third-party route can work differently, using liquidity on the destination side and settling between providers later. The details depend on the route, so its quote should say what token arrives and what costs it includes.
This distinction explains why “less received” does not always mean a fee was taken from the token amount. Source gas may reduce your wallet’s ETH balance separately; a bridge charge may be deducted from the transfer; and a swap may produce a different value because of its exchange rate, price impact, or stated fee.
A worked quote separates output from total cost
Suppose you route 1,000 USDT into ETH, and the quoted rate before route costs is 0.00032 ETH per USDT. That gives 0.32 ETH before any swap or bridge deductions. If the quote estimates 0.5% in combined route costs and price impact, the estimated output is about 0.3184 ETH.
Now suppose the source transaction costs around $8 worth of gas. That gas is a separate wallet expense, not another 0.5% reduction from the 0.3184 ETH, unless the quote explicitly says gas is included or paid from the output. These are illustrative numbers; the actual exchange rate, gas estimate, route fee, and price impact vary with network conditions, liquidity, and the route chosen.
For a like-for-like transfer, compare the same token on both networks and inspect any explicit bridge fee. For a bridge-and-swap, compare the destination output with a same-time reference rate, then account separately for source gas. This tells you whether the gap comes from conversion, fees, or the cost of executing the transactions.
Check the quote and transaction record before retrying
Before signing, confirm the source and destination networks, the token on each side, the estimated output, the minimum received, and whether gas is included. Keep enough native currency on the source network for the transfer and any required approval; also consider whether you will need native currency on the destination network to make a later transaction.
After signing, use the source transaction record to confirm what left your wallet and whether the transaction succeeded. Then check the destination address and token balance. A confirmed source transaction can still be waiting for the cross-chain leg to complete; sending again before checking can create a second transfer.
If you want to move and swap assets across chains in one flow, a Mantle bridge swap service can handle that cross-chain route for you. I would compare its quoted destination amount with the token and minimum you actually need, then check separately which network gas costs the quote includes. That gives you a useful basis for deciding whether to proceed from your wallet.
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