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# OKX Median transaction fee Methodology

## 1. Overview

Median transaction fee measures the median fee paid across all transactions on X Layer. A typical user's transaction cost is represented by this metric, preventing skewing from exceptionally high or low values. The metric is utilized to evaluate the cost efficiency and economic accessibility of the network. Transaction fees on X Layer are paid using the native gas asset, OKB, and are converted to USD.

## 2. Data sources

- **Blockchain events**: Transaction execution data, including gas and fee parameters, covering X Layer
- **External data**: End-of-day price feeds for the native gas asset (OKB)

## 3. Step-by-step calculation

### Component A: Transaction fee extraction

- **Purpose**: To calculate the total fee paid for each individual transaction
- **Logic**: For each transaction, the L2 execution fee and the L1 security fee are calculated and summed. The L2 execution fee is calculated by multiplying the gas used by the gas price. The L1 security fee is calculated by multiplying the L1 gas used, L1 gas price, and L1 fee scalar. Both components are normalized by decimal precision and summed to determine the total transaction fee in the native gas asset (OKB).
- **Key fields**: `gas_used`, `gas_price`, `l1_gas_used`, `l1_gas_price`, `l1_fee_scalar`

### Component B: Median fee calculation

- **Purpose**: To determine the daily median transaction fee in the native asset
- **Logic**: Transactions are grouped into daily intervals based on block timestamps. The median (50th percentile) transaction fee is calculated from the distribution of total transaction fees within each day.
- **Key fields**: `block_timestamp`, `fee_amount`

### Component C: USD conversion and aggregation

- **Purpose**: To convert the median transaction fee to USD
- **Logic**: The daily median transaction fee is multiplied by the end-of-day price of the native gas asset (OKB) to obtain the USD-denominated median transaction fee. Daily granularity is maintained with UTC day boundaries.
- **Key fields**: `transaction_fee_median`, `price_usd`

*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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