Fermi Swap quotes: what to check before you refresh

On Ethereum, a fermi swap quote is an estimate of the tokens a trade can return at a particular moment and order size. FermiSwap is classified by DefiLlama as a proprietary AMM that fills trades from its own token inventory, rather than from shared liquidity pools.

Refreshing matters because the displayed output is tied to the quote’s inputs and may no longer describe the trade the network will execute.

That inventory model affects how to read the number. DefiLlama’s methodology says its reported FermiSwap volume counts only trades filled by the protocol against its inventory. A quote is therefore specific to the pair and size requested; it should not be treated as a fixed exchange rate for every order. The fermi swap reference belongs in that same context: compare the terms shown for the trade you are actually preparing.

What changes when you refresh a fermi swap quote?

Refreshing asks the interface to calculate the trade again using current conditions. The quoted output can move if the market price changes, the available inventory changes, or the route and execution costs differ. The result is a new estimate, not a promise that the earlier one was wrong or that the new one will hold until confirmation.

For an exact-input swap, the input amount stays fixed while the estimated output can change. For an exact-output swap, the desired output stays fixed while the input required can change. Make sure the refreshed quote still matches the trade you intended, including the token pair and amount, before approving the wallet transaction.

Which parts of the quote should you compare?

Compare the amount you expect to receive after fees, not just the headline rate. The on-chain execution boundary is set by the transaction’s minimum-output condition: if the measured amount received falls below that threshold, the swap can revert. A wider tolerance gives execution more room to move, but also permits a worse result than a tighter threshold.

• Estimated output: Check the token and amount, and whether the interface shows a gross or net figure.
• Minimum received: Read the lowest output the transaction will accept, not only the estimate.
• Fees and price impact: Account for charges and the effect of your order size on the quoted rate.
• Network and wallet request: Confirm the chain, token, spender or contract, and transaction details before signing.

These fields describe different costs and constraints. Gas is paid for processing the transaction; it does not improve the token amount received. A quote that looks better before fees may be worse after them, so compare the final amount on a like-for-like basis.

When should you refresh again before swapping?

Refresh after changing the amount, token pair, or execution settings, and again if time has passed or the market has moved. The refreshed result is useful only if the wallet transaction still uses the same parameters. If the quote changes materially between refresh and confirmation, pause to inspect the updated output and minimum received.

FermiSwap’s documented router mechanics illustrate why estimates and execution need separate checks: its quote functions evaluate available venues, while the swap applies an output floor during execution. That does not establish which interface or route a particular user’s transaction will take, so the wallet’s chain and call details remain decisive.

For most trades, the practical choice is to refresh once the order is ready, compare net output and minimum received, then submit only if those terms still fit the intended trade. A refresh is a current estimate; the transaction parameters determine what can execute.