# Scroll Average transaction fee Methodology

## 1. Overview

The average transaction fee metric measures the mean cost per transaction on the Scroll network in USD. This metric is calculated by dividing the total daily transaction fees by the total daily transaction count. It provides insight into the cost efficiency of the Scroll Layer 2 network and helps users understand typical transaction costs. The calculation combines both Layer 2 execution fees and Layer 1 data availability fees to provide a comprehensive view of transaction costs on Scroll.

## 2. Data sources

The calculation relies on the following raw data sources:
- **Scroll blockchain transaction records**: Complete transaction data from the Scroll network including transaction hashes, addresses, gas usage, gas prices, and Layer 1 fees
- **End-of-day token price feeds**: ETH price data used to convert native token fees to USD values
- **Token metadata**: Information about ETH token addresses and symbols for proper identification

## 3. Step-by-step calculation

### Component A: Raw transaction data extraction
- **Purpose**: Extract and standardize raw transaction data from Scroll blockchain
- **Logic**: Process Scroll transaction records by casting relevant fields to appropriate data types. Each transaction record includes block timestamp, transaction hash, sender and receiver addresses, gas usage, gas price, and Layer 1 fees. The token address is hardcoded as ETH (`0x5300000000000000000000000000000004`) and chain is identified as scroll
- **Key fields**: `block_timestamp`, `transaction_hash`, `from_address`, `to_address`, `gas_used`, `gas_price`, `l1_fee`

### Component B: Daily gas fee calculation
- **Purpose**: Calculate total daily gas fees by combining Layer 2 and Layer 1 costs
- **Logic**: Aggregate transaction data by day and calculate two fee components. Layer 2 gas fees are computed by multiplying gas used by gas price and dividing by 1e18 to convert from wei to ETH. Layer 1 fees are converted from wei to ETH by dividing by 1e18. Both components are summed to get total daily fees per token and chain
- **Key fields**: `timestamp` (truncated to day), `l2_gas_fee`, `l1_gas_fee`, `token_address`, `chain`

### Component C: Fee aggregation and USD conversion
- **Purpose**: Convert ETH-denominated fees to USD and prepare for metric calculation
- **Logic**: Take the combined Layer 1 and Layer 2 fees and convert them to USD using end-of-day price feeds. The conversion process handles decimal places and applies current exchange rates. Additional metadata fields are added including business classification (blockchain, Layer 2) and chain identification
- **Key fields**: `fees` (in USD), `timestamp`, `chain_id`, `business_line`, `market_sector_id`

### Component D: Daily transaction counting
- **Purpose**: Count distinct transactions per day for average calculation
- **Logic**: Process the same raw transaction data by truncating timestamps to daily boundaries and counting distinct transaction hashes. This ensures each transaction is counted exactly once regardless of any duplicate records. Additional metadata fields are added to match the fee data structure
- **Key fields**: `transaction_count`, `timestamp`, `chain_id`, `to_address`

### Final aggregation
- **Combining components**: The total daily fees (in USD) are joined with daily transaction counts using the timestamp as the join key
- **Currency conversion**: Fees are already converted to USD in the fee aggregation step using end-of-day price feeds
- **Time aggregation**: Data is aggregated to daily boundaries by truncating timestamps to the day level
- **Final calculation**: Average transaction fee is calculated by dividing total daily fees by total daily transaction count using safe division to handle edge cases where transaction count might be zero, preventing division by zero errors

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

Average transaction fee

Scroll

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

Scroll is an L2 smart contract platform for decentralized applications on Ethereum. Scroll was founded by Sandy Peng, Haichen Shen, and Ye Zhang and launched in 2023.

SCR tokenholders own and govern the protocol. Scroll's investors include Polychain, Qiming Venture Partners, etc.

ScrollSCR

Average transaction fee

Average transaction fee

Competitive landscape

Chain breakdown