Ethereum Gas fees can reach tens or even hundreds of dollars during network congestion, making them a heavy burden for users with small transactions. The good news is that there are many effective ways to reduce Gas fee spending. This article shares multiple practical strategies for saving on Gas fees.
Why Should You Care About Gas Fee Optimization?
Gas fees are the direct cost of using a blockchain. Taking Ethereum as an example:
- A simple ETH transfer can cost $3–10
- A Uniswap Swap can cost $10–50
- An NFT mint can cost $20–100
- Complex DeFi operations can cost $50–200
If you frequently perform on-chain operations, Gas fees can make up a significant portion of your investment costs. Learning to optimize Gas fees is an essential skill for every crypto user.
How Much Can You Save by Choosing Low-Gas Time Windows?
Ethereum Gas prices fluctuate with network usage, and the difference between time periods can be several-fold.
Low Gas Fee Time Windows
- UTC 2:00–8:00 AM (Beijing time 10:00 AM–4:00 PM): U.S. users are sleeping and transaction volume decreases
- Weekends: Overall transaction volume is lower than on weekdays
- Stable market periods: When there are no major market moves or hot project launches
High Gas Fee Time Windows
- UTC 2:00–8:00 PM: Active U.S. trading hours
- Hot project launches: NFT mints, new token listings, etc.
- Extreme market volatility: Large rallies or crashes trigger high transaction volumes
Actual Savings
Choosing low-Gas time windows can typically save 30%–70% on Gas fees. For example, a Gas price of 100 Gwei during peak hours may drop to just 20–30 Gwei during off-peak hours.
How Much Can You Save by Using Layer 2 Networks?
Layer 2 is the most effective Gas fee saving solution. Layer 2 networks are built on top of Ethereum, inheriting its security while drastically reducing transaction fees.
Mainstream Layer 2 Comparison
| Network | Simple Transfer Gas Fee | Swap Gas Fee | Savings |
|---|---|---|---|
| Ethereum Mainnet | $3–10 | $10–50 | Baseline |
| Arbitrum | $0.1–0.5 | $0.3–1 | 90%+ |
| Optimism | $0.1–0.5 | $0.3–1 | 90%+ |
| Base | $0.01–0.1 | $0.05–0.3 | 95%+ |
| zkSync | $0.05–0.2 | $0.1–0.5 | 95%+ |
How to Migrate to Layer 2
- Add the Layer 2 network in MetaMask
- Bridge assets from Ethereum to Layer 2 using the official bridge
- Conduct daily transactions on Layer 2
- Bridge assets back to Ethereum mainnet when needed
How Much Can You Save Using BSC or Other Low-Fee Chains?
If you do not necessarily need to operate on Ethereum, using a low-fee chain directly is the simplest solution.
- BSC: Gas fees around $0.01–0.1, with a mature DEX ecosystem including PancakeSwap
- Polygon: Gas fees around $0.001–0.01, with many Ethereum DApps already deployed
- Avalanche: Gas fees around $0.01–0.1
- Solana: Gas fees around $0.001
When withdrawing from Binance, choosing these low-fee networks can significantly reduce withdrawal fees.
How to Manually Lower Gas Fees in MetaMask?
MetaMask allows users to customize Gas settings.
Steps
- On the Gas fee confirmation page after initiating a transaction
- Click "Edit" or the Gas fee area
- Select the "Low" speed option (longer wait time but lower fee)
- Or select "Advanced Settings" to adjust manually
Advanced Gas Settings (EIP-1559)
- Max Base Fee: The maximum Base Fee you are willing to pay — setting it lower can save money but may result in longer waits
- Max Priority Fee: The tip for validators — usually 1–2 Gwei is sufficient
- Gas Limit: Not recommended to lower manually, as it may cause the transaction to fail
Important Notes
- Setting Gas too low will cause the transaction to stay pending for a long time or fail
- Failed transactions still consume Gas, so do not set it too low
- Refer to the "Low" price on etherscan.io/gastracker as a guideline
What Other Tips Are There for Saving Gas Fees?
Batch Transactions
Combine multiple small transactions into one larger transaction to pay Gas only once. For example, do a single Swap instead of multiple small Swaps.
Use Gas Tokens
Some protocols offer Gas tokens (such as CHI) — buy them when Gas is low and use them when Gas is high to save costs. However, this approach is more complex and suited for advanced users.
Choose Gas-Optimized DApps
Some DApps have Gas-optimized smart contracts, consuming less Gas for the same operation. For example, Uniswap V3 is more Gas-efficient than V2 for certain trades.
Use Aggregators
DEX aggregators (like 1inch) consider Gas costs in addition to finding the best price, selecting the trading path with the lowest overall cost.
Security Reminder
When optimizing Gas fees, be sure to keep the following safety points in mind:
- Do not choose insecure networks or DApps just to save Gas: Security always takes priority over cost
- Do not set Gas Limit too low: This may cause the transaction to fail and waste Gas
- Be aware of cross-chain risks: When using bridges to move to low-fee chains, choose reliable bridges
- Verify Layer 2 security: Choose Layer 2 networks that have been audited and verified
- Do not delay urgent operations because of high Gas: If you need to urgently revoke an approval or transfer assets, do not hesitate
- Keep sufficient Gas reserves: Always maintain enough native tokens in your wallet for emergencies
Will Ethereum Gas Fees Decrease in the Future?
As the Ethereum Layer 2 ecosystem develops and technology upgrades (such as Proto-Danksharding) roll out, Layer 2 Gas fees will continue to decrease. Ethereum mainnet Gas fees depend on usage volume and may not drop significantly in the short term, but Layer 2 provides an effective alternative.
What Is Used as Gas Fee on BSC?
BSC uses BNB as the Gas fee token. You need to ensure your wallet has enough BNB before operating on BSC. You can withdraw a small amount of BNB from Binance App (Apple users refer to the iOS installation guide) to your BSC address as a Gas fee reserve.
Can Gas Fees Be Paid with USDT?
Generally not. Gas fees on each chain can only be paid with its native token (ETH for Ethereum, BNB for BSC, etc.). However, some protocols and wallets are developing "Gasless" features that allow paying Gas fees with other tokens.
Can I Cancel a Pending Transaction to Get the Gas Back?
A pending transaction has not been confirmed yet, so you can cancel it by sending a new transaction with the same nonce but a higher Gas fee. However, the cancellation transaction itself also requires Gas, so you may not necessarily save money.
Are Cross-chain Bridge Transfer Gas Fees High?
Cross-chain bridge costs include the source chain Gas fee, bridge service fee, and destination chain Gas fee. The total cost depends on the chains and bridge used. Bridging from Ethereum to Layer 2 is typically inexpensive (a few dollars), while the reverse may be more costly.