How to use Fermi Swap from your own wallet
Fermi Swap lets you review a token conversion before signing from your wallet; check the network, quoted output, fees and approval details before you proceed.
The Chainvane Desk5 min read

To use fermi swap from your own wallet, connect a compatible wallet, choose the assets and network shown in the interface, then review and sign the proposed transaction. The key difference from a custodial exchange is who controls the funds: they remain in your wallet until you authorize an onchain transaction. That gives you direct control, but it also makes the network, token address and transaction details your responsibility.
Start with a wallet that holds the token you plan to spend and enough of the network’s native asset to cover any transaction fee the wallet displays. Open the service by entering its address yourself, then check that the page and wallet are using the network you intend. The name alone does not establish which chains or tokens are supported. The fermi swap reference belongs in your own verification process: confirm that the connected wallet, selected network and transaction prompt all match what you expect before approving anything.
How do you connect a wallet to Fermi Swap?
Connect by choosing your wallet in the interface and approving its connection request, then confirm the address shown on the page. A connection request normally lets an application read a public wallet address and request transactions; it does not, on its own, authorize a token transfer. A signature or transaction approval is a separate step, and its wording matters.
Check that the wallet is on the same network shown by the swap interface. If it asks to switch networks, compare the proposed network with the one you meant to use. A token with the same ticker can exist on different chains, and a similarly named asset may be unrelated. When choosing a token, use its displayed network and, where available, verify its contract address against a source you already trust. If the page does not make the network or token identity clear, stop before signing.
Some wallet-based swaps also request an allowance for a token. An allowance permits a contract to spend a specified amount of that token later. Read the wallet prompt to see which token and spender it names and how much is being approved. An exact allowance limits permission to the amount entered; a larger or unlimited allowance can reduce repeat prompts but leaves broader spending permission in place. Choose only a permission level you understand.
What should you check before signing a Fermi Swap?
Before signing, compare the amount you are spending with the amount the quote says you will receive. The quoted rate is only one part of the decision: network fees, any service fee shown, price impact and slippage can change the effective result. The minimum received amount, if displayed, is the floor the transaction accepts. A tighter slippage setting limits how much the output can worsen before the transaction fails; a wider setting can make execution more likely but permits a poorer result.
Use this short review before you submit:
- Confirm the wallet address, network and both token identities.
- Compare the input amount, quoted output and minimum received.
- Review every fee and the slippage setting shown for the transaction.
- Read the wallet’s approval prompt, including the contract and allowance amount.
Then compare the total cost with the nearest alternative available to you. A wallet’s built-in swap or another trading interface may show a different route or quote. Compare the amount you would receive after displayed fees, not just the headline exchange rate. A route with more steps may add costs or execution risk, while a simpler route can still produce a worse price. If the quote changes before you sign, assess the updated numbers rather than relying on the earlier screen.
What happens after you approve the swap?
After you approve, the wallet submits the transaction to the selected network. Wait for the wallet or transaction view to show a result before treating the exchange as complete. If it succeeds, check the destination token balance; a wallet may need the token added to its display before showing it. If it remains pending, avoid submitting a second swap until you know whether the first transaction is still active.
A failed transaction may still consume a network fee, depending on the network and failure point. A successful transaction can also return less than the initial quote if the market moved within the slippage limit. Those are ordinary features of onchain execution, not a reason to approve a prompt whose details you cannot explain. Never enter a recovery phrase into a swap page; a wallet connection or swap does not require it.
For most readers, the sound approach is to start with a small amount, use a clear quote and approve only the permissions needed for that trade. The trade-off is straightforward: direct wallet control removes the need to deposit funds with a custodian, but shifts transaction review and recovery responsibility to the user. Watch the supported networks and token list shown in the interface, the quote and minimum output at signing, the allowance requested, and the final transaction status. Those are the signals that determine whether a wallet-based swap is clear enough to proceed.