MetaMask allows users to customize gas fees for their transactions, enabling them to control the speed and cost of their Ethereum transactions. Here’s how you can adjust gas fees in MetaMask.

1. Accessing Gas Fee Settings

To adjust gas fees in MetaMask, start by initiating a transaction. Once you click on the 'Send' button or any action that requires a transaction, the MetaMask interface will pop up.

2. Choosing Gas Fee Options

In the transaction confirmation window, you will see the estimated gas fee. Click on the pencil icon next to the gas fee details to access different options:

• Low: A lower gas fee that may result in slower transaction processing.
• Market: A gas fee that reflects the current market rate, balancing cost and speed.
• Aggressive: A higher gas fee that prioritizes your transaction for faster processing.

3. Advanced Gas Controls

If you want more control over your gas fees, you can enable advanced gas controls:

// Enabling advanced gas controls in MetaMask
const advancedGasControlsEnabled = true;

if (advancedGasControlsEnabled) {
    // User can set custom gas fees
    const maxFeePerGas = 50; // in gwei
    const maxPriorityFeePerGas = 10; // in gwei
    console.log(`Max Fee: ${maxFeePerGas} gwei, Max Priority Fee: ${maxPriorityFeePerGas} gwei`);
}

4. Setting Custom Gas Fees

To set custom gas fees, click on 'Advanced Options' in the gas fee settings. Here, you can manually input:

• Max Fee: The maximum amount you are willing to pay for gas.
• Max Priority Fee: The tip you want to give to miners to prioritize your transaction.

// Example of setting custom gas fees
const userDefinedMaxFee = 60; // in gwei
const userDefinedMaxPriorityFee = 15; // in gwei

console.log(`Custom Max Fee: ${userDefinedMaxFee} gwei, Custom Max Priority Fee: ${userDefinedMaxPriorityFee} gwei`);

5. Saving Your Settings

If you frequently use specific gas settings, you can save them as your default. Make sure to check the box that allows you to save your settings for future transactions.

Conclusion

By adjusting gas fees in MetaMask, you can optimize your transaction costs and ensure timely processing. Understanding how to navigate the gas fee settings will help you make informed decisions based on your transaction needs.