Module 3 · Lesson 15 of 45

Saving gas & using layer-2 networks

⏱ 5 min read ● Beginner Module 3 · Fees & mechanics

You don't have to accept Ethereum-mainnet gas prices. The biggest lever a beginner has is simply where they trade.

Use a cheaper network

The single most effective move is to trade on a layer-2 or a low-fee chain:

  • Layer-2s (Arbitrum, Base, Optimism) bundle many transactions and settle them on Ethereum, inheriting much of its security while cutting fees to cents.
  • Solana keeps fees at a fraction of a cent by design.

For most everyday swaps there's little reason to pay mainnet gas when an L2 offers the same tokens far cheaper.

Time it

Gas is a live auction, so quieter periods are cheaper. If a trade isn't urgent, checking a gas tracker and waiting out a spike can cut the cost sharply. Weekends and off-peak hours are often calmer.

Mind the trade size

Gas is a flat cost per transaction, not a percentage — so a fixed fee is brutal on a tiny trade and negligible on a large one:

Trade sizeA $2 gas fee equals…
$20 swap10% of the trade
$200 swap1%
$2,000 swap0.1%

On an expensive chain, batching errands into fewer, larger transactions saves real money.

Other levers

  • Aggregators can find routes that cost less overall, fees included.
  • Reuse trusted approvals rather than re-approving constantly.
  • Don't over-tip — a large priority fee only makes sense when you genuinely need speed.

Put together, a beginner trading on Base or Solana, off-peak, in sensible sizes, will rarely think about gas at all.

Key terms
Layer-2A network on top of Ethereum that batches transactions to cut fees.
RollupThe technology L2s use to settle many trades cheaply on the base chain.
Gas trackerA tool showing current network fee levels so you can time a trade.
Flat feeA per-transaction cost that doesn't scale with trade size.
!Common mistakes
  • Doing many tiny swaps on Ethereum mainnet, where gas can exceed the trade's value.
  • Paying mainnet fees out of habit when the same token trades on a cheap L2.
  • Over-tipping for speed on trades that aren't time-sensitive.
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