How to set a custom priority fee in Phantom wallet?

Phantom Wallet lets you set a custom priority fee to speed up Solana transactions by offering validators extra incentives, especially useful during network congestion or urgent actions like NFT mints.

Jul 03, 2025 at 03:36 am

What is a Priority Fee in Phantom Wallet?

In the Solana blockchain ecosystem, transactions require a certain amount of computational resources to be processed. To prioritize how quickly these transactions are confirmed, users can set a priority fee. This fee essentially tells validators to process your transaction faster by offering an additional incentive. Phantom wallet, being one of the most popular wallets for interacting with Solana-based applications, allows users to customize this fee manually. Understanding how to set a custom priority fee ensures you can manage both the speed and cost of your transactions effectively.

Why Would You Want to Customize the Priority Fee?

Setting a custom priority fee becomes crucial when network congestion is high or when you need urgent transaction confirmation. For instance, during NFT minting events or major DeFi interactions, the default fee may not be sufficient to get your transaction processed quickly. By adjusting the priority fee, you increase the likelihood that validators will pick up your transaction sooner than others. This customization gives users more control over their on-chain activity, especially in time-sensitive scenarios.

How Does Phantom Wallet Handle Transaction Fees by Default?

Phantom wallet typically calculates a recommended transaction fee based on current network conditions. When you send a transaction, Phantom estimates the base fee plus a suggested priority fee depending on how busy the network is at that moment. While this automated system works well under normal circumstances, it doesn’t always account for individual preferences or unique situations where higher fees might be necessary for faster processing. That’s where manual adjustments come into play.

Step-by-Step Guide to Setting a Custom Priority Fee

To adjust the priority fee in Phantom wallet, follow these steps:

• Open the Phantom browser extension and ensure you're connected to the correct network (mainnet-beta, devnet, or testnet).
• Initiate a transaction by clicking “Send” or interacting with a decentralized application (dApp).
• Before confirming the transaction, locate the gas or fee settings section — it's usually labeled as "Transaction Settings" or "Advanced Options."
• Toggle on the option for manual fee configuration if available.
• Look for the field labeled "Priority Fee (microLamports)" — this is where you input your desired value.
• Input a higher number to increase the priority fee, which should result in faster transaction confirmation.
• Review all details carefully before signing and submitting the transaction.

It’s important to note that setting excessively high fees can lead to unnecessary costs, while too low a fee might result in delays or failed transactions.

Understanding MicroLamports and Their Role in Fee Calculation

Solana uses lamports as its smallest unit, similar to how Ethereum uses gwei. However, Phantom displays fees in microLamports, where 1 Lamport equals 1,000,000 microLamports. Adjusting the priority fee means specifying how many microLamports you're willing to pay per compute unit consumed by your transaction. For example, a basic transfer might consume around 200,000 compute units, so setting a priority fee of 1 microLamport would mean paying 200,000 microLamports (or 0.0002 Lamports) in addition to the base fee. Understanding this relationship helps you make informed decisions when customizing fees.

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Frequently Asked Questions

Q: Can I change the priority fee after submitting a transaction?

No, once a transaction is submitted to the Solana network, its fee cannot be modified. The only way to alter the priority fee is to cancel the transaction (if still pending) and resubmit it with the updated fee settings.

Q: Is there a risk of overpaying when setting a custom priority fee?

Yes, entering a significantly high priority fee can lead to unnecessary expenses. It's advisable to monitor current network conditions using tools like Solana.fm or Phantom’s own fee suggestions to determine an optimal fee.

Q: Do all dApps support custom priority fees through Phantom?

Not all decentralized applications allow users to modify priority fees directly within their interface. In such cases, you may need to use Phantom’s native transaction settings or switch to a different dApp that supports advanced fee controls.

Q: What happens if my priority fee is too low?

If the priority fee is insufficient, validators may deprioritize your transaction, leading to slower confirmation times or even failure if the transaction exceeds the maximum allowed retries or timeouts.