Three components, one ETH balance

OP Mainnet documents transaction fees as an execution fee, an L1 data fee and an operator fee. All are paid from the same ETH balance on OP Mainnet; the split matters when you are reading a receipt or estimating a cost, not when you are funding the account.

The L1 data fee is the part that moves with Ethereum congestion rather than with activity on OP Mainnet. That is why an identical transfer can cost noticeably more on one day than another.

Timing

Transfers between OP Mainnet addresses confirm quickly. Canonical withdrawals to Ethereum involve a challenge period of several days. As on other layer 2s, exchange withdrawals and third-party bridges are separate routes with separate timings.

Token versions

Circle issues native USDC on OP Mainnet, and bridged representations of USDC also exist from the period before native issuance. Read the contract address on this network before a deposit or a swap, and check which version the receiving platform credits.

Cost in practice

For small stablecoin transfers, OP Mainnet is typically far cheaper than Ethereum mainnet. The practical constraint is acceptance: the receiving platform must list OP Mainnet as a deposit network for your asset, and must credit the token version you hold.

Frequently asked

What is the operator fee?

It is one of the three fee components OP Mainnet documents, alongside the execution fee and the L1 data fee. All three are paid in ETH from the same balance.

Why is my fee higher when OP Mainnet is quiet?

The L1 data component reflects the cost of posting data to Ethereum, so it tracks Ethereum congestion rather than local activity.

Can I pay OP Mainnet fees with USDC?

Not by default. Fees are paid in ETH on OP Mainnet. Some wallets offer conditional arrangements for supported transactions; check your wallet’s own documentation rather than assuming.

Sources & further reading

  1. Optimism: transaction fees

    Execution, L1 data and operator fee components.

  2. Circle: USDC contract addresses

    Native USDC deployment addresses per network.

  3. Ethereum: gas and fees

    Gas units, base fee, priority fee and the gwei denomination.

Sources checked on 18 September 2026. Network features and platform support can change; check the relevant provider before acting.

Network notes are educational summaries of public documentation, not an endorsement of a network, token or service, and not investment advice. Read our editorial policy.