Abstract batches users' transactions and submits them to Ethereum, paying a share of the transaction fees to Ethereum validators (expense).

Abstract is an L2 smart contract platform for decentralized applications on Ethereum. Abstract was founded by Luca Netz and the Igloo Inc. team, and launched in 2025.

Abstract team & investors own and govern the protocol. Abstract's investors include Founders Fund, 1kx, Fenbush Capital, etc.

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Abstract

# Abstract Bridge deposits Methodology

## 1. Overview

Bridge deposits represents the cumulative net value of assets deposited to Abstract through its bridge infrastructure. This metric tracks the total value locked (TVL) in the Abstract ecosystem by measuring deposits from Ethereum to Abstract minus any withdrawals back to Ethereum. The calculation aggregates both ETH and ERC20 token bridge transactions on a daily basis, converts amounts to USD, and maintains a running cumulative total to show the net bridge position over time.

## 2. Data sources

The calculation relies on several key data sources:
- **Bridge contract events**: Parsed events from the zkSync Era bridge contract on Ethereum that handles Abstract deposits and withdrawals
- **Deposit initiation events**: `BridgehubDepositBaseTokenInitiated` events for ETH deposits and `BridgehubDepositInitiated` events for ERC20 token deposits 
- **Deposit finalization events**: `BridgehubDepositFinalized` events that confirm successful completion of ERC20 deposits
- **Withdrawal events**: `WithdrawalFinalizedSharedBridge` events for completed withdrawals from Abstract back to Ethereum
- **Token metadata**: Token contract information including decimal places for proper amount calculation
- **End-of-day price feeds**: Daily token price data for USD conversion

## 3. Step-by-step calculation

### Component A: ETH deposit tracking
- **Purpose**: Captures ETH deposits bridged from Ethereum to Abstract
- **Logic**: Extracts data from `BridgehubDepositBaseTokenInitiated` events on the zkSync Era bridge contract. Filters for chain ID '2741' which identifies Abstract network. The `amount` field contains the ETH deposit amount in wei. Token address is hardcoded to WETH contract address (`0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2`) for consistency in downstream processing
- **Key fields**: `block_timestamp` for timing, `amount` for deposit value, `transaction_hash` for unique identification, `address` for bridge contract

### Component B: ERC20 deposit tracking  
- **Purpose**: Captures ERC20 token deposits bridged from Ethereum to Abstract, ensuring only finalized deposits are counted
- **Logic**: Extracts initiated deposits from `BridgehubDepositInitiated` events and joins with `BridgehubDepositFinalized` events on transaction hash to ensure only completed deposits are included. Filters for chain ID '2741' to target Abstract. The `amount` field contains token amounts and `l1Token` provides the source token contract address
- **Key fields**: `block_timestamp` for timing, `amount` for deposit value, `l1Token` for token identification, `transaction_hash` for matching initiation with finalization

### Component C: Withdrawal tracking
- **Purpose**: Captures completed withdrawals from Abstract back to Ethereum to calculate net bridge position
- **Logic**: Extracts data from `WithdrawalFinalizedSharedBridge` events filtering for chain ID '2741'. Includes special handling to convert native token addresses (`0x0000000000000000000000000000000000000001`) to WETH address for consistency. The `amount` field contains withdrawal amounts
- **Key fields**: `block_timestamp` for timing, `amount` for withdrawal value, `l1Token` for token identification

### Component D: Daily aggregation and decimal correction
- **Purpose**: Combines all bridge transactions and applies proper decimal formatting
- **Logic**: Unions ETH deposits, ERC20 deposits, and withdrawals (with negative amounts) into a single dataset. Truncates all timestamps to daily boundaries using `timestamp_trunc`. Applies the `convert_to_usd_and_correct_decimals` macro to adjust token amounts based on their decimal places from token metadata, but does not yet convert to USD
- **Key fields**: `timestamp` (daily), `token_address`, `chain_id`, `bridge_deposits` (corrected amounts)

### Component E: Daily and cumulative calculations
- **Purpose**: Aggregates corrected amounts by day and calculates running cumulative totals
- **Logic**: Groups corrected bridge transactions by day, chain, market sector, business segment, product, and token address, summing the `bridge_deposits` amounts. Then calculates cumulative running totals using window functions partitioned by the same dimensions and ordered by timestamp
- **Key fields**: `bridge_deposits` (daily sum), `bridge_deposits` (cumulative running total)

### Component F: Forward filling and USD conversion
- **Purpose**: Creates continuous time series and converts to USD values
- **Logic**: Applies forward filling using the `fill_forward` macro to ensure each token has values for all dates, carrying forward the last known cumulative amount for missing dates. Then applies the `convert_to_usd_and_correct_decimals` macro with USD conversion enabled to multiply token amounts by end-of-day prices
- **Key fields**: `bridge_deposits` (forward-filled cumulative amounts in USD)

### Final aggregation
- **Combining components**: All processing occurs in sequence within a single model, building from raw events to final metric
- **Currency conversion**: USD conversion uses end-of-day price feeds applied to cumulative token amounts after decimal correction
- **Time aggregation**: Daily boundaries are established by truncating block timestamps, with forward filling ensuring continuous daily values
- **Final calculation**: The metric represents the cumulative net USD value of all assets bridged to Abstract, calculated as the sum of ETH deposits plus ERC20 deposits minus withdrawals, with proper decimal correction and USD conversion applied to the running cumulative total

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

Value of assets held in a project's bridge contracts.

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Bridge deposits

Bridge deposits

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