# Katana Vault Bridge Expenses Methodology

## 1. Overview

Expenses for Katana Vault Bridge is measured as the total cost incurred to operate its yield distribution mechanism. These expenses are represented by the redistribution of yield to depositors, which is paid out in underlying vault bridge assets. This metric is utilized to evaluate the operational costs and the net value distributed to participants of the bridge. Yield distributions are processed and tracked through the Merkl Distributor contract, representing an indirect operating expense for Katana Vault Bridge.

## 2. Data sources

- **Blockchain events**: `Claimed` events from `Distributor` contracts, covering Katana
- **External data**: End-of-day price feeds and asset metadata for the underlying vault bridge assets

## 3. Step-by-step calculation

### Component A: Yield claim extraction

- **Purpose**: Yield distribution claims for Katana Vault Bridge assets are extracted.
- **Logic**: `Claimed` events are parsed from the canonical Merkl Distributor contract on Katana. Transactions where the event is marked as removed are excluded. Claims are filtered specifically for the Katana Vault Bridge asset addresses, which include vbUSDC, vbETH, vbUSDT, vbWBTC, and vbUSDS. Raw claim amounts are aggregated daily by asset.
- **Key fields**: `block_timestamp` (timing), `token_address` (asset identification), `amount` (raw claim quantity).

### Component B: Decimal normalization and USD conversion

- **Purpose**: Raw asset amounts are normalized and converted to USD.
- **Logic**: Raw claim amounts are normalized by the decimal precision of each respective asset using asset metadata. Normalized amounts are then multiplied by the end-of-day asset prices on the corresponding day to determine the USD value of the distributed yield.
- **Key fields**: `amount` (raw claim quantity), `decimals` (asset precision), `price_usd` (end-of-day price).

### Component C: Daily aggregation

- **Purpose**: Daily expenses for Katana Vault Bridge are aggregated.
- **Logic**: USD-denominated yield distribution expenses are summed daily to produce the final daily expenses metric for Katana Vault Bridge. Missing days are filled with zeros to ensure a continuous daily time series.
- **Key fields**: `timestamp` (timing), `expenses` (USD value).

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

Total project operating and incentive expenses.

Expenses

Bridges

The network uses pessimistic proofs via the AgglayerGateway for settlement on Ethereum, with vault bridges for cross-chain asset transfers.

Katana Network provides a scalable execution environment connected to Ethereum through the Agglayer interoperability layer.

Katana Vault Bridge

Expenses

Expenses

Chain breakdown