In this lesson
- find out what a Solana fee is made of
- understand when and why a priority fee is worth it
- learn why a transaction sometimes fails – and that you pay even then
Fees on Solana are usually so small you hardly notice them. Until everyone rushes for the same new token. Then the motorway turns into a toll booth with a fast lane – and whoever does not pay for priority waits in the queue.
The base fee#
Every transaction pays 5,000 lamports per signature, i.e. 0.000005 SOL. An ordinary transaction has one signature. At a SOL price of 150 USD that is less than a tenth of a cent. Half is burned, half goes to the validator.
The priority fee#
Every transaction states how much computing it needs – in so-called compute units. On top of that it can offer a price per unit. The result is the priority fee:
priority fee = number of compute units × price per unit
The leader validator that assembles the block favours transactions with higher offers. Wallets usually set the priority fee themselves depending on how busy the network is.
Local fee markets#
Solana does not raise prices for the whole network at once. Usually only specific accounts are crowded – say the liquidity pool of a new memecoin that thousands of bots are fighting over. Transactions that touch those accounts pay a high priority fee. Meanwhile an ordinary SOL transfer goes through for almost nothing.
Why a transaction fails#
- It expired. Every transaction refers to a recent block and is valid only for about 150 blocks – with the shorter slots from October 2026 that is roughly 40 seconds. If it does not make it into a block by then, it lapses.
- It exceeded the slippage. When swapping tokens you set how far the price may move. If it moves further, the transaction fails – and protects you by doing so.
- The priority was too low. In a rush, those who offered more get ahead of you.
- It ran out of compute. A complex transaction needed more units than it asked for.
Watch out: a failed transaction that made it into a block pays the fee – both base and priority. An expired transaction that never made it into a block pays nothing.
Priority is not a guarantee
Even a high priority fee does not guarantee you buy at the price you see. In a chase for a new token, bots will still get ahead of you – and you pay fees even for the transactions that fail.
Common myths#
- "Fees on Solana are always negligible." Base fees yes, priority fees in a rush no.
- "A failed transaction is free." If it made it into a block, you pay the fee.
- "A higher fee = a better price." A fee buys a place in line, not a price.
Summary
- The base fee is 0.000005 SOL per signature; half is burned.
- Priority fee = compute units × offered price; it buys priority in the block.
- Only crowded accounts get more expensive, not the whole network.
- A transaction can expire or fail – a failed one in a block still pays the fee.