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

Arbitrum One is an L2 smart contract platform for decentralized applications on Ethereum. Arbitrum was founded by Offchain Labs and launched in 2021.

ARB tokenholders own and govern the protocol. They currently run the only sequencer and take a cut of the total transaction fees paid by users (revenue). Arbitrum’s investors include Polychain, Alameda Research, Coinbase Ventures, etc.

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Arbitrum One

# Arbitrum One Bridge deposits Methodology

## 1. Overview

Bridge deposits measures the total USD value of assets deposited into Arbitrum's bridge contracts on Ethereum. This metric tracks user funds that have been bridged from Ethereum to the Arbitrum Layer 2 network, representing the total value locked in Arbitrum's bridging infrastructure. The calculation monitors the aggregate balance of all tokens held in specific Ethereum smart contract addresses that serve as Arbitrum's official bridge deposit contracts.

## 2. Data sources

- **Ethereum blockchain events**: Parsed `Transfer` events and transaction traces from Ethereum mainnet to track token movements into and out of bridge addresses
- **Token balance snapshots**: Daily balance data for ERC-20 tokens and ETH held in the specified bridge contract addresses
- **End-of-day price feeds**: Token price data for USD conversion of all assets held in bridge contracts
- **Token metadata**: Contract information and decimal precision data for accurate token amount calculations
- **Chain availability data**: Data quality indicators to ensure reliable metric reporting

## 3. Step-by-step calculation

### Component A: Bridge address portfolio tracking
- **Purpose**: Calculate the total USD value of all assets held in Arbitrum's bridge deposit addresses on Ethereum
- **Logic**: The calculation monitors five specific Ethereum contract addresses that serve as Arbitrum's official bridge deposit contracts: `0x8315177ab297ba92a06054ce80a67ed4dbd7ed3a`, `0xcee284f754e854890e311e3280b767f80797180d`, `0xa3a7b6f88361f48403514059f1f16c8e78d60eec`, `0xa10c7ce4b876998858b1a9e12b10092229539400`, and `0x0f25c1dc2a9922304f2eac71dca9b07e310e8e5a`. For each address, the system processes all token transfer events and transaction traces to maintain accurate daily balance snapshots for every token held. This includes both ERC-20 tokens and native ETH balances.
- **Key fields**: Daily `balance` values for each token at each bridge address, converted to USD using end-of-day exchange rates

### Component B: Business metadata addition
- **Purpose**: Add contextual business classification data to the bridge deposit values
- **Logic**: Each daily bridge deposit value is tagged with business metadata to categorize the metric properly within Token Terminal's framework. The metric is classified under the `blockchains_l2` market sector to group it with other Layer 2 blockchain metrics, and assigned to the `blockchain` business segment to indicate it measures core blockchain infrastructure value.
- **Key fields**: `market_sector_id` set to blockchains_l2, `business_segment_id` set to blockchain, `chain_id` indicating the Ethereum chain where deposits are held, and `timestamp` for daily aggregation

### Final aggregation
- **Combining components**: The total bridge deposits value is calculated by summing the USD value of all token balances across all five bridge contract addresses for each day
- **Currency conversion**: All token amounts are converted to USD using end-of-day price feeds, with appropriate decimal adjustments applied based on each token's contract specifications
- **Time aggregation**: Data is aggregated to daily boundaries using midnight UTC timestamps, with each day representing a snapshot of total bridge deposits at that point in time
- **Final calculation**: The final metric represents the total USD value of all assets deposited in Arbitrum's bridge contracts, calculated as the sum of USD-converted token balances across all specified bridge addresses. A forward-fill strategy is applied to handle missing dates, ensuring continuous metric availability. Chain availability filters are applied to exclude dates where data quality may be compromised.

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

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

Arbitrum OneARB

Bridge deposits

Bridge deposits

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