What Are Gas Fees?
Gas fees are the transaction costs you pay to use a blockchain network. When you send crypto, swap tokens, or interact with a smart contract, the computers that verify your transaction (called validators or miners) need to be compensated for their work. That compensation is the gas fee.
Think of gas like postage for a letter. The “letter” is your transaction, and the “postal service” is the blockchain network. Just like postage costs more for heavier or more complex packages, gas fees are higher for more computationally intensive transactions.
Why Do Gas Fees Change?
Gas fees are determined by supply and demand. Each block on the blockchain has limited space for transactions. When many people want to transact at the same time, they compete for that space by offering higher fees. This drives up the cost for everyone.
Common triggers for high gas fees:
- Popular NFT mints or token launches
- Major market volatility (many people rushing to buy or sell)
- Airdrop claim windows
- DeFi liquidation cascades
Gas Fees by Network
Different networks have vastly different fee structures:
- Ethereum mainnet: The most expensive, ranging from $1 to $100+ during congestion. Fees go to validators.
- Layer 2 networks (Base, Arbitrum, Optimism): Typically under $0.10. These batch transactions before posting to Ethereum.
- Solana: Extremely low fees, usually under $0.01.
- BNB Smart Chain: Low fees, typically $0.05-$0.30.
How to Save on Gas Fees
- Use Layer 2 networks — if your wallet and the recipient both support a Layer 2, use it.
- Time your transactions — Ethereum mainnet fees tend to be lowest early morning UTC on weekdays.
- Use our tool — the Should I Send Now? tool checks live conditions for you.
- Batch operations — some protocols let you combine multiple actions into one transaction.
- Set gas limits carefully — most wallets let you adjust the gas price. Lower priority means lower fees but slower confirmation.