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 Average transaction fee Methodology

## 1. Overview

The Optimism average transaction fee metric measures the average cost per transaction on the Optimism Layer 2 network, expressed in USD. This metric is calculated by dividing the total daily transaction fees collected on Optimism by the total number of transactions processed each day. The metric provides insight into the cost efficiency of the Optimism network and helps users understand the typical transaction cost they can expect when using the platform.

## 2. Data sources

The calculation relies on several key data sources:
- **Optimism transaction records**: Complete transaction data from the Optimism blockchain including gas usage, gas prices, L1 fee components, and transaction metadata
- **Base chain fee distribution events**: Parsed `FeesDisbursed` events from the FeeDisburser contract on Base chain that capture fee distributions related to Optimism operations
- **End-of-day token price feeds**: Token price data for USD conversion of ETH-denominated fees
- **Account label metadata**: External labeling data for Optimism addresses to categorize transaction recipients

## 3. Step-by-step calculation

### Component A: Daily transaction fees calculation
- **Purpose**: Aggregates all transaction fees collected on Optimism per day, converted to USD
- **Logic**: The calculation combines two main fee sources. First, it processes Optimism transaction records to extract L2 gas fees by multiplying `gas_used_amount` by `gas_price`, and extracts L1 gas fees from the `l1_fee_amount` field in transaction receipts. These wei amounts are converted to ETH by dividing by 1e18. Second, it incorporates additional fee distributions from Base chain events where Optimism-related fees are disbursed, using the `paidToOptimism` amount from `FeesDisbursed` events. All fee amounts are then converted to USD using end-of-day price feeds and aggregated by day
- **Key fields**: `gas_used_amount`, `gas_price`, `l1_fee_amount`, `paidToOptimism`, `block_timestamp`, `token_address`

### Component B: Daily transaction count calculation  
- **Purpose**: Counts the total number of unique transactions processed on Optimism per day
- **Logic**: Processes Optimism transaction records by truncating `block_timestamp` to daily boundaries and counting distinct `transaction_hash` values. Transactions are grouped by `to_address` and enriched with account labels from external metadata to categorize transaction destinations, though the final count aggregates across all categories. The count includes all successful transactions regardless of their destination or purpose
- **Key fields**: `transaction_hash`, `block_timestamp`, `to_address`, `account_title`

### Final aggregation
- **Combining components**: The total daily fees and total daily transaction counts are joined on the same date timestamp to ensure matching time periods
- **Currency conversion**: All fees are converted to USD using end-of-day token price feeds, with ETH being the primary fee token (address `0x4200000000000000000000000000000000000006`)
- **Time aggregation**: Both components use daily timestamp truncation to align on 24-hour periods in UTC
- **Final calculation**: The average transaction fee is calculated using safe division of total daily fees divided by total daily transaction count, with zero-filling applied for days with no transactions to maintain metric continuity

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

OP MainnetOP

Average transaction fee

Average transaction fee

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