Validators process transactions and receive fees from users (supply-side fees).

Aptos is a smart contract platform for decentralized applications (a blockchain). Aptos was founded by Mo Shaikh and Avery Ching and launched in 2022.

APT token holders own and govern the protocol. They currently don’t take a cut of the total transaction fees paid by users (revenue). Aptos’ investors include Binance Labs, Jump Crypto, Apollo, etc.

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Blockchains (L1)

Aptos

# Aptos Expenses Methodology

## 1. Overview

The Aptos expenses metric measures the USD value of token incentives distributed daily on the Aptos blockchain as staking rewards to validators. This metric captures the network's operational costs in the form of APT tokens distributed to maintain network security and consensus. The calculation involves extracting staking reward distribution events from the Aptos blockchain, converting token amounts to USD, and aggregating them daily.

## 2. Data sources

- **Aptos blockchain events**: Parsed `DistributeRewardsEvent` and `DistributeRewards` events from the Aptos blockchain containing validator reward distributions
- **Price feeds**: End-of-day APT token price data combining Chainlink price feeds (from August 10, 2023 onwards) and CoinGecko daily market data (before August 10, 2023)
- **Transaction metadata**: Aptos transaction data including block timestamps, transaction hashes, block heights, and event indices for proper event identification and ordering

## 3. Step-by-step calculation

### Component A: Reward event extraction
- **Purpose**: Extract and parse staking reward distribution events from the Aptos blockchain
- **Logic**: Filter Aptos blockchain events for specific event types (`0x1::stake::DistributeRewardsEvent` and `0x1::stake::DistributeRewards`) that represent validator reward distributions. Parse JSON event data to extract the `pool_address` (validator pool) and `rewards_amount` (raw token amount) fields. Convert raw token amounts from integer format to decimal APT tokens by dividing by 10^8 (APT uses 8 decimal places). Include transaction metadata like block timestamp, transaction hash, block number, and event index for proper identification and ordering.
- **Key fields**: `block_timestamp` for daily aggregation, `pool_address` identifying validator pools, `amount` containing converted APT token amounts, `transaction_hash` and `event_index` for unique event identification

### Component B: Price data preparation  
- **Purpose**: Provide accurate USD prices for APT tokens across the entire historical period
- **Logic**: Combine two price data sources to ensure complete historical coverage. Use Chainlink price feeds for APT token prices starting from August 10, 2023, when reliable on-chain price data became available. For earlier dates, use CoinGecko daily market data to fill the historical gap. The data sources are unioned to create a continuous price series with no overlapping dates.
- **Key fields**: `timestamp` for daily price matching, `price` containing USD price per APT token

### Component C: Daily aggregation and USD conversion
- **Purpose**: Sum daily reward distributions and convert to USD values
- **Logic**: Group reward events by daily timestamp and aggregate the total APT token amounts distributed each day across all validator pools. Join the aggregated daily token amounts with the corresponding daily APT prices. Calculate USD values by multiplying the daily token amounts by the daily price. Apply business categorization fields including chain_id as 'aptos', business_line as 'Blockchain', market_sector_id as 'blockchains_l1', and contract_name as 'APT'.
- **Key fields**: `timestamp` truncated to daily boundaries, `token_incentives` containing USD-denominated daily reward totals, various classification fields for business reporting

### Final aggregation
- **Combining components**: The daily aggregated and USD-converted reward amounts represent the complete token incentives calculation
- **Currency conversion**: USD conversion uses end-of-day APT prices matched to the corresponding reward distribution date
- **Time aggregation**: All reward events are aggregated to daily boundaries using timestamp truncation
- **Final calculation**: The `token_incentives` values from the aggregation step are directly mapped to `expenses` in the final model, representing the daily USD cost of validator rewards on the Aptos network. The finalization macro ensures proper schema validation and fills any missing dates with zero values.

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

Total project operating and incentive expenses.

AptosAPT

Expenses

Expenses

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