What is Transaction Fee?
Crypto Glossary Definition
An expense that must be paid to miners in order for a cryptocurrency to be sent to a different wallet. This fee can vary based on how congested the network is, among other things.
Why Transaction Fee Matters
A transaction fee is what you pay to have your transaction processed and included in a block — it typically rises during network congestion, since miners/validators prioritize whichever pending transactions pay the highest fee.
Transaction Fee in Practice
A user tries to send a small amount of ETH to a friend on a Tuesday afternoon and is surprised to see the estimated transaction fee is several times higher than what he paid making the identical kind of transfer over the weekend. Checking a network activity dashboard, he sees that a popular NFT collection is minting that same afternoon, flooding the network with thousands of competing transactions all trying to get included in the next block. Because miners and validators prioritize whichever pending transactions offer the highest fee, everyone else's transfers, including his, get pushed to the back of the queue unless they're willing to pay more to jump ahead. He waits an hour for the congestion to ease and resubmits his transfer with a lower fee, and it goes through at a fraction of the earlier estimated cost once the minting rush has died down. The experience teaches him to check network congestion before sending anything time-sensitive, and to understand that a transaction fee isn't a fixed cost set by any single party, it's closer to a real-time auction for limited block space, where demand from unrelated activity elsewhere on the network can directly affect what he pays to move his own funds between two wallets he controls.
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