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Blockchains (L1)

Plasma

# Plasma Average fees per user (AFPU) Methodology

## 1. Overview

Average Fees Per User (AFPU) measures the average amount of fees paid by each daily active user on the Plasma blockchain. This metric answers the business question: "How much does each user contribute in fees to the network on a daily basis?" The calculation divides total daily fees collected by the network by the number of daily active users, providing insight into user monetization and network fee efficiency.

## 2. Data sources

The AFPU calculation relies on several core data sources:
- **Blockchain transaction data**: Plasma blockchain transaction records containing sender addresses, gas usage, and effective gas prices
- **Blockchain block data**: Plasma block records providing base fee per gas information for EIP-1559 fee calculations
- **External price data**: End-of-day price feeds for converting native XPL token amounts to USD values
- **Token metadata**: Plasma native token information including the XPL token contract address and symbol

## 3. Step-by-step calculation

### Component A: Daily active users calculation
- **Purpose**: Count unique users who initiated transactions each day
- **Logic**: Extract all transaction records from Plasma blockchain data and identify unique sender addresses per day. Transaction senders are classified as "Transaction sender" user type and associated with the "blockchains_l1" market sector. Daily boundaries are established using timestamp truncation to day level. To efficiently handle large datasets, HyperLogLog (HLL) sketches are used for approximate distinct counting, providing scalable aggregation across multiple dimensions including project level, chain level, user type, and product breakdowns.
- **Key fields**: `from_address` from transactions becomes `user_address`, `block_timestamp` truncated to day becomes `timestamp`, `user_type` set to "Transaction sender"

### Component B: Daily fees calculation
- **Purpose**: Calculate total network fees collected each day in USD
- **Logic**: Process Plasma transaction data using the EIP-1559 fee model where total fees consist of base fees (burned) and priority fees (paid to validators). For each transaction, extract gas usage, effective gas price, and base fee per gas from transaction and block data. Calculate base fees as gas used multiplied by base fee per gas, and priority fees as gas used multiplied by the difference between effective gas price and base fee per gas. All amounts are converted from wei to token units by dividing by 1e18. Daily fees are summed by day and converted to USD using end-of-day price feeds for the XPL token.
- **Key fields**: `gas_used`, `effective_gas_price`, and `base_fee_per_gas` used in fee calculations, `token_address` referencing XPL token contract, results aggregated by `timestamp` truncated to day

### Final aggregation
- **Combining components**: Daily fees (in USD) and daily active user counts are combined through division to calculate the average fee per user
- **Currency conversion**: All fee amounts are converted to USD using end-of-day price feeds applied to the native XPL token before the final division
- **Time aggregation**: Both fees and user counts use consistent daily boundaries established by truncating timestamps to day level
- **Final calculation**: AFPU equals total daily fees in USD divided by the count of daily active users, with the division handled by a specialized ARPU calculation macro that includes validation and zero-filling for days with missing data

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

PlasmaXPL

Average fees per user (AFPU)

Average fees per user (AFPU)

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