What Priority Fees Mean on Solana | Glow Matrix Core Field Notes
When Solana blocks become congested, wallets and DEX front ends offer an optional priority fee — sometimes labelled "Jito tip" or "priority lamports." Learners often assume this is a platform charge. It is not. You are bidding for validator attention so your transaction lands in the next few slots rather than waiting behind thousands of pending swaps.
Base fee versus priority fee
Every Solana transaction pays a base fee denominated in lamports (one billionth of a SOL). This is fixed by protocol rules and is usually tiny. The priority fee is additional: you attach extra lamports to your transaction's compute budget instruction, signalling urgency.
In our terminology intensive we compare this to posting a letter: the stamp covers delivery (base fee), while express handling costs extra (priority fee).
When the label appears
Jupiter, Phantom, and most aggregators surface priority fee controls when network activity spikes — often during NFT mints or memecoin surges. The UI may suggest low, medium, or high presets. These presets translate to micro-SOL amounts that change with congestion.
Risk awareness angle
Setting priority fee to zero during heavy load can mean your swap executes minutes later at a worse price — or fails after you assumed it went through. Setting it too high burns SOL on transactions that would have confirmed anyway. Neither outcome is a "scam"; both follow from misreading the term.
We recommend noting the fee in your trade journal alongside slippage tolerance so you can review total execution cost later.
Verifying on explorers
After confirmation, open the transaction on Solana Explorer or Solscan. Look for Compute Budget instructions and compare fee fields to what the interface quoted. Discrepancies usually come from changed network conditions between quote and send — another vocabulary point we cover in clinic sessions.