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Why Are Crypto Fees Different on Ethereum, Arbitrum, Base and BNB Smart Chain?

These networks can share EVM-style accounts while charging fees under different execution and settlement economics. A similar transfer can therefore cost very different amounts.

Last reviewed: 2026-10-05.

Editorial & technical review
Published by Terenval
Technical review: Terenval Wallet team
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Direct answer: Fees differ because Ethereum Mainnet, Ethereum L2s such as Arbitrum and Base, and BNB Smart Chain have different blockspace markets, execution/settlement designs, congestion levels and fee components. Ethereum users pay for Mainnet execution directly; L2 users pay L2 execution plus costs associated with posting/settling data to Ethereum; BNB Smart Chain has its own validator/blockspace economy. Compare the same action at the same time and include bridge/withdrawal costs before declaring a route cheaper.

Key takeaways

Same 0x address format does not imply the same fee market.
Ethereum uses ETH for gas; Base and Arbitrum also use ETH in their normal user flows; BNB Smart Chain uses BNB.
L2 fees can include execution plus an Ethereum/L1 data component.
Congestion and transaction complexity change the final fee.
Lowest transaction fee is not always lowest total route cost.

Network-level differences

Network	User gas asset	High-level fee context	Extra route consideration
Ethereum Mainnet	ETH	L1 execution/blockspace	No L2 bridge needed for Mainnet-native activity
Arbitrum One	ETH	L2 execution + L1-related data/settlement cost	Bridge/withdrawal route can matter
Base	ETH	L2 execution + L1-related data/settlement cost	Bridge/exchange route can matter
BNB Smart Chain	BNB	Independent BSC fee market	Different security/validator and ecosystem context

1. Ethereum Mainnet prices scarce L1 blockspace

Ethereum gas measures computation and state/resource use. Under EIP-1559, the base fee responds to demand and a priority fee can incentivize inclusion. Complex smart-contract calls use more gas than simple ETH transfers.

Mainnet can be expensive during demand spikes because every transaction competes for L1 blockspace.

2. L2s change where execution happens

Arbitrum and Base execute user activity on Layer 2 and settle/post information to Ethereum under their respective rollup designs. This can reduce per-user execution cost, but the fee still depends on L2 conditions and L1 data costs.

A cheap L2 transaction may require a bridge or exchange withdrawal to get funds onto the L2, so compare the whole journey.

3. BNB Smart Chain has a different fee economy

BNB Smart Chain is EVM-compatible but not an Ethereum L2. It has its own chain, validator model and native gas asset BNB. Similar Solidity contracts can run there while fee levels reflect BSC conditions rather than Ethereum Mainnet's blockspace market.

How to compare fees fairly

Compare the same task: simple send vs simple send, swap vs swap.
Capture quotes near the same time.
Include source withdrawal/bridge cost.
Include destination gas and any return path.
Confirm token liquidity and recipient support.
Evaluate network/security assumptions separately from price.

Common mistakes

Calling BNB Smart Chain an Ethereum L2.
Comparing a simple Base transfer with an Ethereum contract interaction.
Ignoring L1 data/bridge costs for an L2 route.
Assuming a historical fee screenshot predicts today's fee.
Moving to a cheaper chain that the recipient/dApp does not support.

How this works in Terenval Wallet

Terenval Wallet includes Ethereum, Arbitrum One, Base and BNB Smart Chain as separate supported network contexts. The network selector lets users review the same account/address under different chains without implying that balances or fees are shared.

Check the wallet's current fee estimate immediately before signing and evaluate total route cost if moving between networks.

Official pages: Supported networks · Security

Open Terenval Wallet

Frequently asked questions

Is Base always cheaper than Ethereum?

For many ordinary transactions Base can be cheaper, but fees vary and total route cost may include bridging/withdrawal.

Is BNB Smart Chain an Ethereum L2?

No. It is a separate EVM-compatible blockchain with its own validator/fee system and BNB gas asset.

Why does Arbitrum gas change when Ethereum is busy?

L2 fees can include costs tied to publishing/settling data on Ethereum, so L1 conditions can affect part of the L2 fee.

Primary and authoritative sources

Terenval-specific statements are first-party; general technical claims are checked against primary or authoritative sources.