Your wallet’s selected network determines which blockchain your next transaction is prepared for and signed on. For a bridge transfer, you usually sign the first transaction on the network where your tokens are now; the destination network is where the bridge aims to deliver them.
What Does Wallet Network Selection Change?
The selected network tells your wallet which chain to use when it reads balances, estimates fees and sends a transaction. On many EVM networks, the transaction signature includes that network’s chain ID, which helps prevent the transaction from being replayed on a different chain.
Switching the wallet network does not move tokens. It changes the wallet’s active connection. A bridge transfer starts with an on-chain transaction on the source network, and the bridge then handles the cross-chain step according to its route. You may need to switch networks again later to view or use the tokens delivered on the destination.
Which Network Should You Pick for a Bridge?
Pick the source network first: that is the chain where the tokens you plan to send are held. The bridge’s destination choice is a separate setting. For example, if you have USDT on Ethereum and want USDT on Arbitrum, select Ethereum in your wallet, then choose Arbitrum as the destination in the bridge interface.
Before signing, check that the quote names the intended source and destination, and that the wallet prompt shows the source network. A cross-chain route such as fermi swap is relevant when you want to move tokens between supported networks, sometimes while exchanging one token for another. The network shown in the wallet still matters: it determines where the initial transaction will be submitted.
Also check the token carefully. A token with the same ticker can have different contract addresses or versions on different chains. The quote should show the asset you are sending, the expected destination asset and amount, plus any route fee or price impact the service displays.
How Do You Check and Sign the Transfer?
Use this sequence for the example of moving 100 USDT from Ethereum to Arbitrum; the amount and networks are illustrative. The wallet pays the first transaction’s network fee in Ethereum’s gas token, even though the transfer is intended to end on Arbitrum.
- Open the bridge and connect the wallet that holds the source tokens.
- Set the source to Ethereum and the destination to Arbitrum in the bridge form.
- Enter 100 USDT and review the quoted amount, token, route fee and estimated delivery time.
- Switch the wallet to Ethereum if it prompts you, then check that the wallet’s network label says Ethereum.
- Read the wallet prompt: confirm the token approval if requested, then review and sign the separate transfer transaction.
- Wait for the source transaction to confirm, then track the bridge status and switch to Arbitrum to check for the delivered tokens.
An approval lets a smart contract spend up to the approved token amount; it is not the bridge transfer itself. Some routes ask for approval first, so you may see two wallet prompts and pay two source-chain fees. Read each prompt and confirm the contract and amount match the route you chose.
What If the Wallet Shows the Wrong Network?
If the wallet prompt shows a different network from the bridge’s source, stop before signing and switch to the source network. If the destination balance does not appear after the source transaction confirms, first check the route’s status and confirm the destination network and token; a transfer can take longer than one block because the bridge must complete its cross-chain step.
In practice, I check the network name in both the bridge form and the wallet prompt immediately before signing. Searching for fermi swap often leads to this same question: the wallet’s selected network controls the source-side signature, while the bridge route specifies where the transfer should end.
Quick Questions
Do I need to switch to the destination network before signing?
Usually, no. You sign the initial transaction on the source network where the tokens are held. The bridge handles delivery to the destination as a later step. Switch to the destination network when you want to check or use the received tokens, unless the bridge or wallet clearly instructs you otherwise.
Why does the wallet ask me to pay a fee in another token?
The source network charges its fee in that network’s gas token, not necessarily in the token you are bridging. For the Ethereum-to-Arbitrum example, the source fee is paid on Ethereum. Keep enough gas token in the wallet for the approval and transfer prompts, if both are required.
Choose the source network in your wallet, verify it in the signing prompt, and let the bridge route handle the destination.