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Unichain

# Unichain Median transaction fee Methodology

## 1. Overview

The transaction fee median metric calculates the median fee paid for transactions on the Unichain Layer 2 network on a daily basis. This metric provides insight into typical transaction costs users experience, offering a more representative measure than average fees since it's less influenced by extremely high or low outlier transactions. The calculation accounts for both Layer 2 execution costs and Layer 1 data availability costs, which is characteristic of Layer 2 scaling solutions.

## 2. Data sources

- **Unichain transaction records**: Complete transaction data from the Unichain blockchain including gas usage, gas pricing, and Layer 1 cost components
- **End-of-day ETH price feeds**: Daily ETH price data for USD conversion of fee amounts
- **Token metadata**: ETH token information including contract addresses and decimal specifications for Unichain

## 3. Step-by-step calculation

### Component A: Transaction fee calculation
- **Purpose**: Calculate the total fee for each individual transaction on Unichain
- **Logic**: For each transaction, extract gas usage data including both Layer 2 execution costs and Layer 1 data availability costs. Calculate the L2 execution fee by multiplying `gas_used` by `gas_price` and converting from wei to ETH by dividing by 1e18. Calculate the L1 data availability fee by multiplying `l1_gas_used` by `l1_gas_price` and `l1_fee_scalar`, then converting from wei to ETH. Sum both components to get the total transaction fee in ETH.
- **Key fields**: `gas_used` (L2 gas consumption), `gas_price` (L2 gas price), `l1_gas_used` (L1 gas for data availability), `l1_gas_price` (L1 gas price), `l1_fee_scalar` (L1 fee multiplier), `block_timestamp` (transaction timing)

### Component B: Daily median aggregation
- **Purpose**: Calculate the median transaction fee for each day
- **Logic**: Group all transaction fees by day using timestamp truncation. For each day, collect all individual transaction fee amounts and calculate the median using approximate quantiles, specifically taking the 50th percentile value. This provides the typical transaction fee that users experience on that day.
- **Key fields**: `timestamp` (daily bucket), `transaction_fee_median` (50th percentile of daily fees)

### Final aggregation
- **Combining components**: The daily median values are standardized with metadata including chain identifier set to 'unichain', token address set to the ETH contract address on Unichain, and timestamp grain marked as 'day'
- **Currency conversion**: Convert median fee amounts from ETH to USD using end-of-day ETH price feeds, applying the standard Token Terminal conversion methodology without decimal correction since fees are already properly scaled
- **Time aggregation**: Data is aggregated daily with timestamp boundaries set using day truncation
- **Final calculation**: The final metric represents the median transaction fee in USD for each day on Unichain, calculated as the 50th percentile of all transaction fees (L2 execution + L1 data availability costs) converted to USD using end-of-day exchange rates

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

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Median transaction fee

Median transaction fee

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