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 Total value locked Methodology

## 1. Overview

The zkSync Era Bridge TVL (Total Value Locked) metric measures the total USD value of assets held within the zkSync Era bridge system on Ethereum. This metric represents the cumulative value of tokens that users have deposited into the bridge contracts to transfer assets between Ethereum mainnet and the zkSync Era Layer 2 network. The calculation treats bridge contract balances as net deposits, which directly represent the TVL since assets must be locked on Ethereum to mint equivalent tokens on zkSync Era.

## 2. Data sources

The calculation relies on the following raw data sources:

- **Ethereum blockchain events**: Parsed `Transfer` events for ERC-20 tokens and native ETH transfers targeting specific zkSync Era bridge contract addresses
- **Token metadata**: Information about token contracts, decimals, and symbols to properly process transfer amounts
- **End-of-day price feeds**: USD price data for all tokens held in bridge contracts to enable currency conversion
- **Bridge contract addresses**: Three specific Ethereum addresses that serve as the zkSync Era bridge infrastructure

## 3. Step-by-step calculation

### Component A: Portfolio balance calculation

- **Purpose**: Track the current token balances held across all zkSync Era bridge contracts on Ethereum
- **Logic**: The portfolio calculation macro processes all historical `Transfer` events for three specific bridge addresses: `0x57891966931eb4bb6fb81430e6ce0a03aabde063`, `0x32400084c286cf3e17e7b677ea9583e60a000324`, and `0xd7f9f54194c633f36ccd5f3da84ad4a1c38cb2cb`. For each address, the system parses incoming and outgoing transfers for all tokens (both ERC-20 and native ETH), calculates running balances by tracking net flows, and creates daily snapshots of token holdings. Each token balance is converted to USD using end-of-day price feeds, accounting for proper decimal adjustment based on token metadata.
- **Key fields**: The calculation produces `timestamp` (daily), `chain` (Ethereum), `token_address` (specific tokens held), and `balance` (USD-adjusted token balance per address)

### Component B: Net deposits aggregation

- **Purpose**: Aggregate portfolio balances across all bridge addresses to calculate total net deposits
- **Logic**: The system sums the USD-denominated `balance` values across all three bridge addresses for each day, grouping by timestamp and applying business categorization. The aggregation assigns `market_sector_id` as 'bridges' and `business_segment_id` as 'mint_and_burn' to classify this as bridge-related activity. The `product_id` is set to null since this metric tracks the overall bridge system rather than specific products.
- **Key fields**: Produces daily `net_deposits` values representing the total USD value held across all bridge contracts

### Final aggregation

- **Combining components**: The TVL calculation directly uses net deposits as the TVL value, since bridge contract balances represent the total value locked in the system. Assets deposited into bridge contracts are effectively "locked" on Ethereum to enable minting on zkSync Era.
- **Currency conversion**: All token balances are converted to USD using end-of-day price feeds, with proper decimal adjustments applied based on token metadata
- **Time aggregation**: Data is aggregated daily with timestamps representing end-of-day snapshots of bridge contract balances
- **Final calculation**: TVL equals the sum of all USD-denominated token balances held across the three zkSync Era bridge contract addresses on any given day. The finalize_metric_tvl macro applies gap-filling with zeros for missing days and validates the schema to ensure data consistency.

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

Total value locked (TVL)

Total value locked (TVL) — value deposited into the project's applications.

zkSync Era Bridge

Total value locked

Total value locked

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