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Blockchains (L1)

XDC Network

# XDC Network Median transaction fee Methodology

## 1. Overview

The XDC transaction fee median metric calculates the daily median transaction fee paid on the XDC blockchain, expressed in both native XDC tokens and USD. This metric provides insight into the typical cost of transacting on the XDC network by finding the middle value of all transaction fees paid each day. The calculation processes raw blockchain transaction data to compute individual transaction fees, then aggregates these daily using statistical median functions and converts the results to USD using end-of-day price feeds.

## 2. Data sources

The calculation relies on the following raw data sources:
- **XDC blockchain transaction records**: Complete transaction data from the XDC blockchain including gas usage metrics, gas pricing, transaction hashes, addresses, and timestamps
- **XDC transaction gas data**: Specific gas consumption (`gas_used`) and gas pricing (`gas_price`) data for each transaction on the XDC network
- **End-of-day price feeds**: Daily XDC token price data (token address `0x951857744785e80e2de051c32ee7b25f9c458c42`) for USD conversion
- **Chain availability data**: Metadata used to filter results based on data availability and quality

## 3. Step-by-step calculation

### Component A: Transaction fee calculation
- **Purpose**: Calculate individual transaction fees in native XDC tokens
- **Logic**: Extract raw transaction data from XDC blockchain records, focusing on gas consumption and pricing data. For each transaction, calculate the fee by multiplying the `gas_used` (amount of computational resources consumed) by the `gas_price` (price per unit of gas), then divide by 1e18 to convert from Wei (smallest XDC unit) to whole XDC tokens. Handle any null or invalid values by defaulting to 0 using coalesce functions. Include transaction timestamp, hash, and address information for downstream processing.
- **Key fields**: `gas_used` (computational resources consumed), `gas_price` (price per gas unit), `fee_amount` (calculated transaction fee), `block_timestamp` (transaction timing)

### Component B: Daily median aggregation  
- **Purpose**: Calculate the median transaction fee for each day
- **Logic**: Group all individual transaction fees by day using timestamp truncation to daily boundaries. For each day, calculate the median fee amount using approximate quantile functions that divide the fee distribution into 100 quantiles and select the 50th percentile (median value). This statistical approach efficiently handles large transaction volumes while providing accurate median calculations. Apply incremental processing logic to optimize performance by only recalculating recent days when new data arrives.
- **Key fields**: `timestamp` (daily boundary), `transaction_fee_median` (median fee value)

### Component C: USD conversion and standardization
- **Purpose**: Convert native XDC fees to USD and standardize the metric format
- **Logic**: Apply USD conversion using end-of-day XDC token price feeds through the convert_to_usd_and_correct_decimals macro. This process looks up the appropriate XDC price for each day and multiplies the native token fee by the exchange rate. The conversion uses the XDC token contract address `0x951857744785e80e2de051c32ee7b25f9c458c42` to identify the correct price feed. Apply decimal correction as needed and ensure consistent formatting across different time periods.
- **Key fields**: `transaction_fee_median` (USD-converted values), `token_address` (XDC token identifier), `product_id` and `chain_id` (both set to 'xdc')

### Final aggregation
- **Combining components**: The final metric combines the calculated daily median fees with USD conversion and standardized metadata fields
- **Currency conversion**: USD conversion uses end-of-day XDC token price feeds, applying the exchange rate to the median native token fee for each day
- **Time aggregation**: Daily boundaries are established using timestamp truncation, grouping all transactions within 24-hour periods starting at midnight UTC
- **Final calculation**: The final metric value represents the median transaction fee for each day, calculated as the 50th percentile of all individual transaction fees (gas_used × gas_price ÷ 1e18) within that daily period, converted to USD using end-of-day exchange rates and standardized with consistent schema including chain identification, product labeling, and availability filtering

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

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