Layer-2s and alt-L1s have far lower gas than Ethereum mainnet:
Base, Arbitrum, Optimism — typically $0.01–0.05 per swap.
Polygon, BNB Chain, Avalanche — usually under $0.10.
Linea, Scroll, Blast, Mantle — cheap L2s, often a few cents.
Ethereum mainnet — the most expensive, often $2–15 depending on congestion.
How to swap cheaply
Do your swaps on an L2 whenever possible. SwapEdge supports all of the above from one interface, always routes for the best price, and shows the exact gas before you confirm — plus you get 30% cashback on the fee.