How to avoid gas fees on Ethereum: practical tips using Layer-2s
Reduce mainnet (L1) gas by bridging once to an L2 like Arbitrum, Optimism, Loopring, StarkEx apps, or Polygon
Avoiding Ethereum gas fees usually means avoiding Ethereum mainnet fees for day-to-day activity, not eliminating fees entirely. The most practical approach is moving swaps, DeFi, and NFT actions to Layer-2 networks where fees are lower, while accepting the extra step of bridging.
What “avoiding Ethereum gas fees” really means (and the realistic goal)
Ethereum mainnet gas fees can become extremely expensive during congestion, and transaction times can slow down. That combination has pushed many users to look for ways to keep using Ethereum-based assets and apps without paying mainnet prices for every action.
In practice, “avoiding gas fees on Ethereum” usually means reducing how often you transact on Ethereum mainnet (Layer 1, or L1). You still pay fees somewhere, but you try to pay them on a cheaper network for most actions. The most direct method described in the source material is to use Layer-2 (L2) rollups and adjacent L2 networks like Polygon, so most execution happens off L1.
The tradeoff is workflow friction. Rollups are not plug-and-play because you often need to bridge assets from L1 to L2 and sometimes back again. That bridging step typically requires at least one L1 transaction, which means you may still pay L1 gas at the moment you enter or exit an L2.
A practical rule-of-thumb from the source is that L2s are a good default unless you rarely trade or you only trade extremely large amounts where a $200 gas fee is negligible. For most users who swap tokens, use DeFi, or mint NFTs, the realistic goal is to pay L1 gas as infrequently as possible and do the rest of your activity on an L2.
Mechanism: how Layer-2 rollups cut fees while keeping Ethereum security
A rollup is an Ethereum scaling approach that moves transaction execution outside the Ethereum main chain while still retaining some data per transaction on-chain. That design lets transactions leverage Ethereum’s security model while being processed in a separate layer. By moving the bulk of execution away from L1, rollups reduce congestion pressure and can improve confirmation times.
The source distinguishes two broad rollup types that matter for users because they affect cost, confirmation behavior, and withdrawals.
Optimistic rollups assume transactions are valid by default and only run computation when there is a challenge. The source says optimistic rollups can scale Ethereum by a factor of 10–100x and can process complex smart contracts. The user-facing downside is withdrawals. Withdrawal times are significantly longer than ZK-rollups because optimistic rollups rely on fraud challenges.
Zero-knowledge (ZK) rollups batch transactions and generate a validity proof for each batch. The source describes this as reducing the data size of transactions, which lowers gas costs and shortens confirmation times. ZK-rollups also avoid fraud challenges because validity proofs are verified, which enables fast withdrawals.
The source also gives a structural detail for ZK-rollups that helps explain why they can compress activity. A ZK-rollup usually uses two Merkle trees stored on a smart contract, with one tree for accounts and another for balances. Other data the ZK-rollup uses is stored off-chain.
For someone searching “how to avoid gas fees on Ethereum practical tips,” the key takeaway is that rollups aim to keep you in the Ethereum ecosystem while shifting most of your repeated actions to a cheaper execution environment.
Practical tip #1: Use Polygon for low-fee DeFi and swaps (setup + funding)
Polygon is presented as a layer-2 platform that describes itself as “Ethereum’s internet of blockchains.” In the source framing, it offers a scaling solution and a framework for interoperability with other L2 protocols.
The practical gas-fee tip on Polygon is that it uses MATIC for gas instead of ETH. That changes your funding plan. Instead of repeatedly paying ETH gas on Ethereum mainnet, you can operate on Polygon by holding MATIC for transaction fees.
To use Polygon in MetaMask, you add the Polygon network with the specific values provided in the source. In MetaMask, you open the network selector and choose to add a network, then enter the following.
Network Name: Polygon Mainnet. New RPC URL: https://rpc-mainnet.maticvigil.com/. Chain ID: 137. Currency Symbol: MATIC. Block Explorer URL: https://explorer.matic.network/.
Funding Polygon can be done in two ways described in the source. One approach is bridging Ethereum-based ERC-20 tokens to Polygon. The other approach is buying MATIC on a centralized exchange (the source gives Binance as an example) and transferring it to your wallet. The operational requirement is simple but easy to miss. You need a non-zero amount of MATIC to conduct transactions on Polygon.
Once you have MATIC, the source describes Polygon dapps as enabling you to trade, deposit liquidity, or take out loans at a fraction of the cost of Ethereum mainnet. It also lists notable rollup protocols currently only on Polygon as ZKSync, ZKSwap, and the L2 DEX ZigZag.
If your goal is “avoid Ethereum gas fees,” Polygon’s practical advantage in this guide is that you can plan around MATIC as your fee token and keep most activity off L1.
Practical tip #2: Use optimistic rollups (Arbitrum, Optimism) for cheaper swaps
Optimistic rollups are a common “bridge once, then transact cheaply” pattern. In the source, Arbitrum and Optimism are presented as optimistic rollup-based scaling solutions.
Arbitrum is described as enabling messages to pass between smart contracts on the main network and the Arbitrum second-layer chain, where the bulk of the work is done. The results are ultimately recorded on the main network. The source frames this as improving the speed and efficiency of Ethereum transactions.
To use Arbitrum with MetaMask, you add the network using the values provided.
Network Name: Arbitrum mainnet. RPC: https://arb1.arbitrum.io/rpc. Chain ID: 42161. Currency Symbol: ETH. Block Explorer URL: https://arbiscan.io.
After the network is added, the workflow is to bridge your ERC-20 tokens to Arbitrum. The source notes that any Ethereum token is compatible with Arbitrum. There is a key pitfall here for people trying to “avoid gas fees.” You still need ETH to pay for gas on Arbitrum, since ETH is the gas currency in the network settings. If you bridge tokens but do not have ETH available for gas on Arbitrum, you can end up unable to complete the swap or other actions.
Once funded, you trade on an Arbitrum-based DEX. The source lists Anyswap and 1inch as examples. Another common mistake is simply being on the wrong network in the dapp. The source explicitly warns that you need to choose the Arbitrum network in any exchange you use.
Optimism is described as an optimistic rollup designed to scale smart contracts while having the security of the Ethereum chain. The source also notes it is supported by Uniswap V3.
The basic Optimism workflow in the source starts at the official gateway. You connect via https://gateway.optimism.io/ and use the gateway to transfer Ethereum-based tokens you want to trade on Optimism mainnet. As with Arbitrum, you must have ETH to pay for gas.
After bridging, you go to https://app.uniswap.org and choose Optimism instead of Ethereum. The source describes the result as swapping like normal, with confirmation nearly instantaneous and fees ultra low.
For gas-fee avoidance, the practical pattern is consistent. You accept one bridging step, then you do repeated swaps on the cheaper L2 environment, while keeping enough ETH available on that L2 to pay its gas.
Practical tip #3: Use ZK-rollup apps (Loopring, StarkEx ecosystem) to minimize ongoing fees
ZK-rollup options can be especially useful when you want to minimize ongoing fees after an initial move to L2.
Loopring is described as an Ethereum L2 DEX based on ZK-rollup technology. The source says it replicates the interface of order books in an automated market maker setting. It also describes Loopring as a payment application that lets you send ETH and other ERC-20 tokens to any Ethereum address in the Loopring network.
The Loopring workflow in the source starts at https://app.loopring.io/. You connect MetaMask and make sure MetaMask is on Ethereum mainnet. You then transfer tokens to Loopring’s second-layer network. The source emphasizes the cost pattern. You pay a one-time gas fee in ETH to transfer assets to Loopring L2. Once transferred, the assets can be used “gas-free” for as long as you like.
After assets are on Loopring L2, the source says you can swap ETH and Ethereum-based tokens by using the “Trade” tab. For users focused on practical gas savings, this is the core idea. You pay once to enter the L2 environment, then you try to keep your activity inside it.
StarkEx is described as a ZK-rollup scaling protocol developed by StarkWare in 2020. The source says it aims to help non-custodial DEXs offer low-cost swaps and high liquidity. It supports ERC-20 and ERC-721 tokens, and the source notes this allows NFT marketplaces like Immutable X to run on L2.
The source lists examples of applications that run on StarkEx or support it, including DeversiFi, dYdX, Sorare, and Immutable X. The process is described as similar to other L2s in the guide, where you transfer ETH to another layer and then use the application inside that environment.
For the keyword intent, the practical takeaway is that ZK-based environments can reduce repeated mainnet gas payments by keeping your trading or NFT activity within the L2 once you have moved assets there.
Caveats and decision checklist: when L2s help most, and what to watch for
Layer-2s can reduce costs dramatically, but the source is clear that support was still developing. At the start of 2022, users likely could not survive purely on L2s alone. In practical terms, that means you may need more than one approach depending on which apps you use and where liquidity or features exist.
Bridging and withdrawals are the main operational caveats. Bridging adds steps and friction because you move assets between L1 and L2. Optimistic rollups add another constraint. The source says withdrawals are significantly longer on optimistic rollups due to fraud challenges. If you expect to move funds back to L1 quickly, that delay can be a surprise cost in time even if the L2 fees are low.
The source also flags centralization risk. In 2021, Ethereum creator Vitalik Buterin warned that rollup technology is still new, block production will probably remain centralized for the foreseeable future, and it may take years to onboard users and refine the technology properly.
A practical checklist based on the source details can prevent the most common mistakes. You pick an L2 that supports the app you want to use, whether that is a DEX, DeFi protocol, or NFT marketplace. You make sure you have the right gas token for that network, which is ETH on Arbitrum and Optimism and MATIC on Polygon. You expect at least one L1 transaction to bridge or deposit, which means you may pay L1 gas at the entry point. You also confirm you selected the correct network inside the dapp before swapping or signing transactions.
If your goal is to avoid Ethereum mainnet gas for most activity, the source recommendation is direct. Use L2 for most Ethereum activities, including swaps, DeFi actions, and NFT minting, and treat mainnet as the settlement layer you touch less often.
