Gas Fee
A gas fee is what a user pays a blockchain network to execute a transaction. On Ethereum it is the amount of computational work the transaction consumes, multiplied by a price per unit that rises and falls with demand for block space.
Also called: network fee
Gas measures computational effort. A simple transfer of ether costs 21,000 units of gas; a swap through a smart contract costs far more, because there is more work to do. What the user pays is that quantity multiplied by a price, and since the EIP-1559 change the price has two parts: a base fee set by the protocol, which is burned and removed from circulation, and a priority fee — a tip — added to make the transaction attractive to validators. Ethereum’s own documentation gives the calculation as units of gas used × (base fee + priority fee).
The base fee is not a market quote; it is computed from how full the previous block was relative to a target, and can move by at most 12.5% per block. That is why costs rise smoothly during congestion rather than spiking unpredictably, and why a transaction submitted with too low a fee simply waits rather than failing.
For a payments business the consequence is an operating cost that is variable, denominated in a volatile asset, and not controllable. Moving a stablecoin on a congested network can cost more than the transfer is worth, which is the single biggest reason serious stablecoin settlement runs on low-fee networks and batches where it can. Other chains use different fee models and different words for them; the concept of paying for execution is general, the Ethereum mechanics are not.
In practice
Gas is paid in the network's own native asset, not in the token being moved. A wallet holding a million dollars of a stablecoin and no ETH cannot move any of it — a failure mode that catches treasury teams who funded the asset and forgot the fuel.
Example
A business sends USDC on Ethereum during a quiet period and pays a few cents. The same transfer during a busy hour costs several dollars. Neither price was quoted to it in advance, and nothing about the transfer changed.
Commonly confused with
| Term | How it differs |
|---|---|
| Network fee (cards) | Card schemes also charge “network fees”, which are contractual scheme charges on card transactions. Entirely unrelated to blockchain execution costs, despite the identical phrase. |
| Exchange withdrawal fee | A charge set by an exchange for processing a withdrawal. It may be more or less than the gas actually paid; the exchange keeps the difference. |
See also
- StablecoinA stablecoin is a crypto-asset designed to hold a steady value against a reference, almost always a fiat currency such as the US dollar. How that steadiness is supported differs sharply from one issuer to the next, and so does what a holder can actually redeem.
- TokenizationTokenization means representing an asset, or a claim on one, as a transferable token recorded on a ledger. The token is a record of entitlement; whether legal ownership of the underlying asset moves with it depends on the contract and the governing law, not on the ledger.
- Self-CustodySelf-custody is an arrangement in which the user alone holds the private keys and no service can move the assets. A provider may build the wallet, host the interface and broadcast the transaction, but if it cannot produce a signature, the balance is beyond its reach.
- Hosted WalletA hosted wallet is a wallet where a service holds the private keys on the user’s behalf. The user sees a balance and can instruct a transfer, but the provider is the party that signs, and the provider’s records are what the balance actually rests on.
- USDCUSDC is a US dollar stablecoin issued by Circle. The issuer states that it is fully reserved, redeemable one for one by approved account holders, and reported against attestations published by an accounting firm. Those terms are the issuer’s, and the issuer can change them.
- Fiat On-Ramp and Off-RampA fiat on-ramp is the point where money leaves the banking system and becomes crypto; an off-ramp is the point where it comes back. Both are conversion and settlement points, and both sit on the boundary where banking rules meet crypto rules.