What are gas fees in crypto?
In one line: Gas fees are payments made to a blockchain network, like Ethereum, to process a transaction or run a smart contract. They're paid in the network's coin.
A simple example
On Ethereum, every action uses a set amount of "gas," a measure of work. A plain ETH transfer uses 21,000 gas.
You pay a price per unit of gas, quoted in gwei. One gwei is 0.000000001 ETH.
Say the price is 20 gwei:
21,000 × 20 = 420,000 gwei = 0.00042 ETH.
If ETH were priced at $3,000 (an example, not a forecast), that's about $1.26.
A token swap might use 150,000 gas or more, so the same gas price would cost about 7 times as much.
Why fees go up and down
- Busy network: when many people want space in the next block, the price per gas rises.
- Complex actions: swaps, loans and NFT mints use more gas than a plain transfer.
- The coin's price: fees are paid in ETH, so the dollar cost moves with ETH.
Since 2021, Ethereum fees have a base fee (which is burned, removed from supply) plus an optional tip for the block producer.
Other chains and "layer 2" networks built on Ethereum often charge much lower fees.
Why it matters
Fees can turn a small trade into a loss. A $5 fee on a $50 swap is 10% gone before price moves at all. Count it the same way you'd count a Commission or a Spread.
More on how crypto trading works in crypto trading for beginners.
Common mistakes and tips
- Failed transactions still cost gas. If a transaction fails, the work was still done, so you pay.
- Setting the gas limit too low can cause a failure. Wallets usually set it for you.
- Sending on the wrong network. Make sure the network you send on matches the one you receive on.
- Paying for gas with no ETH in the wallet. You need a little ETH to move tokens on Ethereum.
Most wallets show the fee before you confirm. Read it every time. If it looks high, waiting for a quieter time often helps.
Questions
Why is it called gas?
Like fuel for a car, gas powers the work each transaction needs. More complex actions burn more.
Does Bitcoin have gas fees?
Bitcoin has transaction fees, but they're not called gas. They're based on the size of the transaction in data, not the work done.
Who gets the gas fee?
On Ethereum, the base fee is burned. The tip goes to the validator who adds the block.
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