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World Mobile Chain

# World Mobile Chain Median transaction fee Methodology

## 1. Overview

The World Mobile Chain transaction fee median metric calculates the daily median transaction fee paid by users on the World Mobile Chain network. This metric helps understand the typical cost of transacting on the network and provides insight into network usage patterns and fee structure efficiency. The calculation combines both Layer 2 gas costs and Layer 1 settlement fees, then converts the result to USD using Base chain token prices since World Mobile Chain utilizes the Base chain's WMTX token for fee calculations.

## 2. Data sources

- **World Mobile Chain transaction records**: Raw transaction data including gas usage, gas prices, sender/receiver addresses, transaction hashes, and block timestamps
- **Base chain token metadata**: WMTX token information from Base chain (contract address `0x3e31966d4f81c72d2a55310a6365a56a4393e98d`) used for fee calculations since World Mobile Chain lacks native token addressing
- **End-of-day token price feeds**: USD price data for the WMTX token to enable currency conversion of calculated fees

## 3. Step-by-step calculation

### Component A: Raw transaction fee calculation
- **Purpose**: Calculate individual transaction fees for each World Mobile Chain transaction
- **Logic**: For each transaction, extract gas usage data including `gas_used`, `gas_price`, `l1_gas_used`, `l1_gas_price`, and `l1_fee_scalar` fields. Calculate the total transaction fee by combining Layer 2 costs (gas used multiplied by gas price) with Layer 1 settlement costs (L1 gas used multiplied by L1 gas price multiplied by L1 fee scalar). Convert both components from wei to token units by dividing by 1e18, then sum them to get the total fee per transaction. Handle null values by defaulting to zero for any missing fee components.
- **Key fields**: `block_timestamp` for daily grouping, `gas_used` and `gas_price` for L2 costs, `l1_gas_used`, `l1_gas_price`, and `l1_fee_scalar` for L1 settlement fees, with final `fee_amount` representing total transaction cost

### Component B: Daily median aggregation
- **Purpose**: Calculate the median transaction fee for each day
- **Logic**: Group all calculated transaction fees by day using timestamp truncation to daily boundaries. For each day, calculate the median fee amount using approximate quantiles at the 50th percentile. This provides the typical transaction fee paid on that day, filtering out both extremely high and low fee outliers that might skew average calculations.
- **Key fields**: `timestamp` truncated to daily boundaries and `transaction_fee_median` representing the 50th percentile fee amount

### Component C: USD conversion and standardization
- **Purpose**: Convert median fees to USD and prepare for final metric output
- **Logic**: Apply USD conversion using end-of-day price feeds for the WMTX token from Base chain. Since World Mobile Chain doesn't have native token addressing, it references Base chain token metadata with address `0x3e31966d4f81c72d2a55310a6365a56a4393e98d` and symbol 'WMTX'. The conversion uses the `convert_to_usd_and_correct_decimals` macro with decimal correction disabled since fees are already in proper token units.
- **Key fields**: `transaction_fee_median` converted to USD values while maintaining original timestamp and adding metadata fields

### Final aggregation
- **Combining components**: The daily median fees flow directly from the aggregation step to USD conversion without additional combining since each day produces a single median value
- **Currency conversion**: USD conversion occurs using end-of-day WMTX token prices from Base chain, applied to the median fee amounts calculated in token units
- **Time aggregation**: Data is aggregated to daily boundaries using timestamp truncation, with each day producing one median transaction fee value
- **Final calculation**: The metric represents the USD value of the median transaction fee paid on World Mobile Chain for each day, with chain identification recasted from 'base' to 'worldmobilechain' and final standardization applied through the `finalize_metric_transaction_fee_median` macro using a fill-zeros strategy for missing data

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

World Mobile ChainWMTX

Median transaction fee

Median transaction fee

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