A swap may fail due to various reasons. The most common is when a transaction runs ‘out of gas.’ The ‘out of gas’ error occurs when all the gas that was allocated for the transaction is consumed before the swap could complete.
To prevent an ‘out of gas’ transaction failure, we recommend using the default Network Fee amount that is suggested by MetaMask. When a swap fails, some of the gas fees may be consumed by the network, but the asset you wished to swap from will still be safe and available in your MetaMask wallet.
If a swap fails your funds will always be safe in your wallet. If your swap fails more than once, please contact our support team so we can investigate the underlying cause.