Update 2: If you are looking to trade UNI, check the price on 1inch before trading on Uniswap. If 1inch suggests 100% Uniswap, then go to Uniswap to trade. Otherwise, trade on 1inch to get better price (with Binance listing, their PMM may have better prices if there is exchange rate discrepancy).
You can set nonce in MetaMask but it is hidden by default. You may want to set your nonce because the gas prices are high and you want to unstuck your transaction. By setting your own nonce, you can try to override a pending transaction. You may not be able to do this via the MetaMask UI – for example if you imported your Ethereum wallet.
Before we begin, note that you need to double-check the nonce that you’re setting. If you set the nonce too low or too high, the transaction won’t get confirmed. This is definitely for advanced users of MetaMask and Ethereum, so do this with care. Read more about nonce on Stack Overflow.
Now that you’re ready, let’s get down to setting your own nonce in your MetaMask
Step-1: Go to your account on the top right corner of your MetaMask extension and click on Settings.
Step-2: Under Settings, click on Advanced Settings. Then find the setting that says: “Customize transaction nonce” Turn this on to change the nonce (transaction number) on confirmation screens. This is an advanced feature, use cautiously. Toggle this to “ON” state.
Step-3: Now you can create a transaction as you normally would (e.g. if you want to send a 0 ETH transaction to yourself) and you’ll see a new field appear called “Set Custom Nonce“. This will show up in the confirmation screen when you try to send the transaction out.
Here, we have manually set the custom nonce to 10000. Make sure you double check the nonce value!
When you hit confirm, MetaMask will broadcast your transaction with the custom nonce that you chose above.