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

OP Mainnet is an L2 smart contract platform for decentralized applications on Ethereum. OP Mainnet was founded by Jinglan Wang, Karl Floersch & Kevin Ho and launched in 2021.

Optimism team & investors own and govern the protocol. Optimism’s investors include Paradigm, a16z, IDEO CoLab Ventures, etc.

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OP Mainnet

# OP Mainnet Bridge deposits Methodology

## 1. Overview

The Optimism bridge deposits metric measures the total USD value of tokens held in Optimism's Ethereum bridge contracts. This metric quantifies the amount of assets deposited from Ethereum that are available for bridging to the Optimism Layer 2 network. The calculation tracks token balances across five specific Ethereum bridge contract addresses by analyzing token transfer events and converting the resulting balances to USD values.

## 2. Data sources

- **Ethereum token transfer events**: Parsed `Transfer` events from ERC-20 token contracts to track token movements in and out of bridge addresses
- **Transaction data**: Ethereum transaction records to validate transfer events and extract block timestamps
- **End-of-day price feeds**: Token price data for USD conversion of token balances
- **Token metadata**: ERC-20 token contract information including decimal precision and symbol data
- **Chain availability data**: Ethereum network availability and data quality indicators

## 3. Step-by-step calculation

### Component A: Bridge address portfolio tracking
- **Purpose**: Calculate token balances held across all Optimism bridge contract addresses
- **Logic**: The system monitors five hardcoded Ethereum bridge contract addresses: `0x99c9fc46f92e8a1c0dec1b1747d010903e884be1`, `0xbeb5fc579115071764c7423a4f12edde41f106ed`, `0x467194771dae2967aef3ecbedd3bf9a310c76c65`, `0x5fd79d46eba7f351fe49bff9e87cdea6c821ef9f`, and `0x76943c0d61395d8f2edf9060e1533529cae05de6`. For each address, the calculation processes all `Transfer` events where the address is either the sender or recipient. Token balances are calculated as the cumulative sum of inflows minus outflows for each ERC-20 token at each bridge address. Two specific tokens are excluded from calculations: `0x8e9b8277e869a05a41d843b6c1d5a12df2c82607` and `0xc3aa18ecf4d3f05196501259d69882368a51d57b`.
- **Key fields**: Bridge contract `address`, token contract `address`, transfer `amount`, block `timestamp`, transfer direction (`to` or `from` the bridge address)

### Component B: USD conversion and standardization
- **Purpose**: Convert token balances to USD values with proper decimal adjustment
- **Logic**: Each token balance is converted to USD using end-of-day token prices. Token amounts are first adjusted for decimal precision using metadata from the token contracts (typically 18 decimals for most ERC-20 tokens, but varies by token). The adjusted token amounts are then multiplied by the corresponding end-of-day USD exchange rate for each token. This ensures accurate valuation regardless of token decimal precision differences.
- **Key fields**: Token `balance`, token `decimals`, end-of-day `price_usd`, calculated `balance_usd`

### Component C: Business categorization
- **Purpose**: Apply consistent business metadata and categorization
- **Logic**: Each calculated balance is tagged with business-relevant metadata. The `chain_id` is set to the source blockchain (Ethereum), `market_sector_id` is assigned as "blockchains_l2" to categorize this as Layer 2 blockchain activity, `business_segment_id` is set to "blockchain" for the overall blockchain segment, and `product_id` is left null as this represents infrastructure-level bridging rather than a specific product.
- **Key fields**: `chain_id`, `market_sector_id`, `business_segment_id`, `product_id`

### Final aggregation
- **Combining components**: All USD-converted token balances are summed across all five bridge addresses for each day to create a single daily `bridge_deposits` value. This represents the total USD value of all tokens held in Optimism bridge contracts.
- **Currency conversion**: USD conversion occurs at the individual token level using end-of-day price feeds before aggregation
- **Time aggregation**: Data is grouped by daily timestamps with forward-fill logic applied for missing data points. When a day has no new data, the previous day's value is carried forward to maintain continuity in the time series.
- **Final calculation**: The final metric value equals the sum of all USD-converted token balances across all monitored bridge addresses, filtered by chain data availability to ensure data quality standards are met.

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

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

OP MainnetOP

Bridge deposits

Bridge deposits

Competitive landscape

Chain breakdown