OP Mainnet batches users' transactions and submits them to Ethereum, paying a share of the transaction fees to Ethereum validators (expense).

OP Mainnet is an L2 smart contract platform for decentralized applications on Ethereum. OP Mainnet was founded by Jinglan Wang, Karl Floersch & Kevin Ho and launched in 2021.

Optimism team & investors own and govern the protocol. Optimism’s investors include Paradigm, a16z, IDEO CoLab Ventures, etc.

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OP Mainnet

# OP Mainnet Fees Methodology

## 1. Overview

The Optimism fees metric measures the total daily fee revenue generated by the Optimism ecosystem in USD. This includes both direct fees paid by users on the Optimism network and revenue-sharing fees received from other chains in the Optimism Superchain. The metric aggregates Layer 1 data availability costs, Layer 2 execution costs, and superchain revenue distributions to provide a comprehensive view of Optimism's fee-based revenue streams.

## 2. Data sources

- **Optimism transaction records**: Complete transaction data from the Optimism blockchain including gas usage, gas prices, and Layer 1 fee components
- **Base contract events**: Parsed `FeesDisbursed` events from Base chain's FeeDisburser contract showing fee-sharing payments to Optimism
- **Unichain contract events**: Parsed `FeesDistributed` events from Unichain's FeeSplitter contract containing Optimism's revenue share amounts
- **Ink transaction records**: Transaction data from the Ink blockchain used to calculate superchain fee-sharing obligations
- **End-of-day price feeds**: Daily ETH/USD exchange rates for currency conversion

## 3. Step-by-step calculation

### Component A: Direct optimism transaction fees
- **Purpose**: Calculates total gas fees paid by users on the Optimism network
- **Logic**: For each Optimism transaction, extract gas usage amounts, gas prices, and Layer 1 fee components. Calculate Layer 2 execution fees by multiplying `gas_used_amount` by `gas_price`. Add Layer 1 data availability fees from the `l1_fee_amount` field. Convert both fee components from wei to ETH by dividing by 1e18. Sum the Layer 1 and Layer 2 components to get total transaction fees. Aggregate all transaction fees daily by summing across all transactions per day.
- **Key fields**: `gas_used_amount`, `gas_price`, `l1_fee_amount`, `l2_gas_fee_amount`, `l1_gas_fee_amount`

### Component B: Base chain fee distributions
- **Purpose**: Captures fee-sharing revenue from Base chain activity paid to Optimism
- **Logic**: Extract parsed `FeesDisbursed` events from Base chain's FeeDisburser contract. From each event, extract the `paidToOptimism` field which represents the amount of fees Base is sharing with Optimism. Convert amounts from wei to ETH by dividing by 1e18. Aggregate daily by summing all fee distribution amounts per day.
- **Key fields**: `paidToOptimism`, `optimism_amount`

### Component C: Unichain fee distributions  
- **Purpose**: Captures fee-sharing revenue from Unichain activity paid to Optimism
- **Logic**: Extract parsed `FeesDistributed` events from Unichain's FeeSplitter contract. From each event, extract the `optimismShare` field representing Optimism's portion of Unichain fee revenue. Convert amounts from wei to ETH by dividing by 1e18. Aggregate daily by summing all fee distribution amounts per day.
- **Key fields**: `optimismShare`, `optimism_amount`

### Component D: Ink superchain fee calculation
- **Purpose**: Calculates Optimism's 15% revenue share from Ink chain transaction fees
- **Logic**: For each Ink transaction, extract gas usage and gas price data. Calculate total Layer 2 gas fees by multiplying `gas_used` by `gas_price`. Apply a 15% rate to determine Optimism's superchain revenue share by multiplying by 0.15. Convert the result from wei to ETH by dividing by 1e18. Aggregate daily by summing all calculated superchain fees per day.
- **Key fields**: `gas_used`, `gas_price`, `optimism_amount`

### Final aggregation
- **Combining components**: Union all four fee components (direct Optimism fees, Base distributions, Unichain distributions, and Ink superchain fees) into a single dataset, grouping by day, chain identifier, and token address. Sum the ETH amounts across all sources to get total daily fees in ETH.
- **Currency conversion**: Apply end-of-day ETH/USD exchange rates to convert the aggregated ETH fee amounts to USD values using external price feed data.
- **Time aggregation**: Truncate all timestamps to daily boundaries and group by day to ensure consistent daily reporting periods across all fee sources.
- **Final calculation**: The final metric value represents the total USD value of fees generated by the Optimism ecosystem each day, including both direct network usage fees and revenue-sharing from Superchain partners.

*This methodology was automatically generated by Token Terminal's methodology analyzer.*

Total value users pay to use a protocol (gross fees, user-paid fees).

OP MainnetOP

Fees

Fees

Competitive landscape

Chain breakdown