Users deposit and lock assets on Ethereum in exchange for an equivalent amount of a corresponding token on zkSync Era. Conversely, users can withdraw assets from zkSync Era in exchange for the same amount on Ethereum.

zkSync Era Bridge is an asset bridge built on Ethereum and zkSync Era. zkSync Era Bridge was developed by Matter Labs and launched in 2023.

Matter Labs team owns and governs the protocol. Matter Labs' investors include a16z, Lightspeed Venture Partners, Blockchain Capital, etc.

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zkSync Era Bridge

# zkSync Era Bridge Revenue Methodology

## 1. Overview

The zkSync Era Bridge revenue metric measures fee income generated by the zkSync Era Bridge protocol from cross-chain bridging operations between Ethereum and zkSync Era. This metric is currently set to 0, indicating that zkSync Era Bridge operates as a fee-free bridge service. The metric maintains a complete time series structure aligned with bridge activity to support consistent reporting and potential future fee implementation.

## 2. Data sources

- **Ethereum blockchain events**: Parsed smart contract events from zkSync Era Bridge v1 contracts deployed on Ethereum
- **Deposit events**: `DepositInitiated` events from the L1ERC20Bridge contract for ERC20 token deposits and `NewPriorityRequest` events from the Diamond contract for ETH deposits
- **Withdrawal events**: `WithdrawalFinalized` events from the L1ERC20Bridge contract for ERC20 token withdrawals and `EthWithdrawalFinalized` events from the Diamond contract for ETH withdrawals
- **Transaction metadata**: Ethereum transaction hashes, block timestamps, and log indices for event tracking
- **End-of-day price feeds**: Token price data for USD conversion and value normalization
- **Token metadata**: Token decimal information and contract addresses for proper amount calculation

## 3. Step-by-step calculation

### Component A: Bridge transaction identification
- **Purpose**: Identify all deposit and withdrawal transactions on zkSync Era Bridge
- **Logic**: Extract bridge events from Ethereum blockchain logs for zkSync Era Bridge v1 contracts. Deposits are captured from `DepositInitiated` events for ERC20 tokens and `NewPriorityRequest` events for ETH deposits. Withdrawals are captured from `WithdrawalFinalized` events for ERC20 tokens and `EthWithdrawalFinalized` events for ETH withdrawals. ETH transactions use the hardcoded WETH contract address for consistent token handling.
- **Key fields**: `block_timestamp` for timing, `transaction_hash` and `log_index` for unique identification, `amount` for transaction value, `token_address` for token identification, and contract `address` for protocol classification

### Component B: Transfer volume aggregation
- **Purpose**: Create daily aggregated bridge volume to establish the metric's time series structure
- **Logic**: Combine deposit and withdrawal transactions into a unified dataset. Truncate transaction timestamps to daily boundaries for time series aggregation. Union deposit and withdrawal events to capture complete bridge activity. Apply USD conversion using end-of-day price feeds and correct token decimals using metadata. Aggregate volume by day, token, and chain dimensions.
- **Key fields**: Daily `timestamp`, `token_address` for token identification, `chain_id` for chain classification, `transfer_volume` for USD-converted amounts, and protocol classification fields

### Component C: Fee calculation
- **Purpose**: Calculate fees generated from bridge operations
- **Logic**: Source the time series structure from transfer volume data but set all fee values to 0. This maintains the same dimensional structure and time coverage as the underlying bridge activity while explicitly indicating no fees are charged.
- **Key fields**: `timestamp` and `timestamp_grain` for time dimensions, `product_id` and `chain_id` for categorization, `fees` set to 0

### Final aggregation
- **Combining components**: Revenue metric inherits the complete dimensional structure from the fees calculation, maintaining the same time series coverage and categorization
- **Currency conversion**: All amounts are already converted to USD in the underlying transfer volume calculation using end-of-day price feeds
- **Time aggregation**: Daily time boundaries established through timestamp truncation of bridge events, with zero-filling applied to ensure complete time series coverage
- **Final calculation**: Revenue is explicitly set to 0 for all time periods, indicating zkSync Era Bridge operates without charging fees to users

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

fees * take_rate (illustrative — revenue is observed directly per project, not derived from take_rate)

Fee revenue retained after supply-side payouts. Before cost of revenue (e.g. L2 DA fees) and before operating expenses.

zkSync Era Bridge

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Revenue

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