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Blockchains (L1)

Plasma

# Plasma Median transaction fee Methodology

## 1. Overview

The Plasma transaction fee median metric measures the median amount users pay in transaction fees on the Plasma blockchain on a daily basis. This metric provides insight into the typical cost of transacting on Plasma and helps track fee market dynamics. The calculation uses Plasma's EIP-1559 fee model, which combines base fees (burned) and priority fees (paid to validators), and converts the results to USD for standardized comparison.

## 2. Data sources

- **Plasma blockchain transaction records**: Individual transaction data including gas usage, effective gas price, sender/receiver addresses, and transaction hashes
- **Plasma blockchain block records**: Block-level data including base fee per gas for EIP-1559 fee calculations
- **End-of-day token price feeds**: USD price data for the Plasma native token (XPL) used for currency conversion
- **Token metadata**: Information about the Plasma native token including its contract address and symbol

## 3. Step-by-step calculation

### Component A: Transaction data preparation
- **Purpose**: Extract and prepare raw transaction and block data for fee calculations
- **Logic**: Pull transaction records from Plasma blockchain including `gas_used` and `effective_gas_price` fields. Join with corresponding block data to obtain `base_fee_per_gas` values. The `effective_gas_price` field represents the total gas price paid per unit of gas under the EIP-1559 model, incorporating both the base fee (which gets burned) and the priority fee (paid to validators). Each transaction is tagged with the Plasma native token address `0x6100e367285b01f48d07953803a2d8dca5d19873` and symbol `XPL`.
- **Key fields**: `block_timestamp` for temporal grouping, `gas_used` for transaction size, `effective_gas_price` for total fee rate, `base_fee_per_gas` for fee model context

### Component B: Fee amount calculation
- **Purpose**: Calculate the total fee paid for each individual transaction
- **Logic**: For each transaction, multiply `gas_used` by `effective_gas_price` to get the total fee in wei (the smallest unit of the native token). Convert from wei to full token units by dividing by 1e18. This gives the actual fee amount paid in XPL tokens for each transaction. Filter to only include transactions within the specified time range for incremental processing.
- **Key fields**: `fee_amount` representing the total transaction fee in native tokens, `block_timestamp` for daily grouping

### Component C: Daily median calculation
- **Purpose**: Calculate the median transaction fee for each day
- **Logic**: Group all transactions by day using daily time boundaries. For each day, collect all individual transaction fee amounts and calculate the 50th percentile (median) using statistical approximation functions. This provides the typical transaction fee that users experienced on that day, filtering out the impact of extremely high or low fee outliers.
- **Key fields**: `timestamp` truncated to daily boundaries, `transaction_fee_median` representing the 50th percentile fee amount

### Final aggregation
- **Combining components**: The daily median values flow directly from the intermediate calculation without additional aggregation
- **Currency conversion**: Convert median fee amounts from native XPL tokens to USD using end-of-day price feeds. The conversion uses the Plasma native token address to lookup appropriate exchange rates
- **Time aggregation**: Data is aggregated to daily boundaries using timestamp truncation, with each day representing a complete 24-hour period
- **Final calculation**: The final metric represents the median transaction fee in USD that users paid on the Plasma blockchain for each day, providing a standardized measure of transaction costs that filters out extreme values and accounts for currency fluctuations

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

PlasmaXPL

Median transaction fee

Median transaction fee

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