opBNB is built on the OP Stack, the same underlying framework as Optimism. It extends the Ethereum Virtual Machine (EVM) to provide faster and cheaper transactions, while leveraging BNB Smart Chain (BSC) for ecosystem integration.

opBNB is an Ethereum-compatible Layer 2 scaling solution designed to improve the performance and affordability of decentralized applications on BNB Chain. It provides high throughput and low fees, making it suitable for gaming, social, and DeFi applications.

opBNB is developed by BNB Chain, which is supported by contributors from the broader Binance ecosystem.

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opBNB

# opBNB Bridge deposits Methodology

## 1. Overview

The opBNB bridge deposits metric measures the total USD value of tokens held in bridge-related addresses on BSC (BNB Smart Chain) that facilitate deposits to the opBNB Layer 2 network. This metric represents the total value locked in bridge contracts that users have deposited to access the opBNB ecosystem. The calculation tracks token balances across specific bridge addresses and converts them to USD using end-of-day price feeds.

## 2. Data sources

The calculation relies on several key data sources:
- **BSC blockchain event logs**: Parsed `Transfer` events from BSC to track token movements in and out of bridge addresses
- **Token balance data**: Current token holdings across the specified bridge addresses on BSC
- **Token metadata**: Contract information, decimal places, and token symbols for proper balance calculation
- **End-of-day price feeds**: USD conversion rates for all tokens held in bridge addresses
- **Chain availability data**: Operational status information for BSC to filter results during network outages or maintenance

## 3. Step-by-step calculation

### Component A: Bridge address configuration
- **Purpose**: Defines the specific BSC addresses that hold bridge deposits for opBNB
- **Logic**: Two hardcoded bridge addresses are specified: `0xcb4cd5b74a2f2d75076fb097da70cef5feac0428` and `0x6df37de57d50ec5a0600510eb8f563f538bdc403`. These addresses represent the smart contracts that hold user deposits intended for bridging to opBNB
- **Key fields**: Account addresses are configured for BSC chain specifically

### Component B: Portfolio balance calculation
- **Purpose**: Calculates the current token balances held across all bridge addresses
- **Logic**: Processes BSC `Transfer` events to build complete balance histories for each token at each bridge address. The calculation tracks all inbound transfers (deposits) and outbound transfers (withdrawals) to determine net token holdings at each point in time. Token amounts are properly adjusted using contract decimal specifications
- **Key fields**: `timestamp`, `chain`, `balance` (adjusted for token decimals), token contract addresses

### Component C: Business data classification
- **Purpose**: Adds metadata to categorize the metric within Token Terminal's taxonomy
- **Logic**: Each record is tagged with `market_sector_id` as 'blockchains_l2' (indicating Layer 2 blockchain category), `business_segment_id` as 'blockchain' (indicating core blockchain infrastructure), and `product_id` as null (since this represents the entire bridge system rather than a specific product). Data is grouped by timestamp, time grain, and chain to aggregate all token balances
- **Key fields**: `market_sector_id`, `business_segment_id`, `product_id`, aggregated `bridge_deposits`

### Final aggregation
- **Combining components**: Token balances across all bridge addresses and token types are summed into a single `bridge_deposits` value for each time period
- **Currency conversion**: Token balances are converted to USD using end-of-day price feeds, with proper decimal adjustments applied before price multiplication
- **Time aggregation**: Daily snapshots are created showing the total bridge deposit value at each timestamp
- **Final calculation**: The total bridge deposits value represents the sum of all token holdings (converted to USD) across the two specified bridge addresses on BSC. A forward-fill strategy is applied to maintain data continuity during periods with no deposit or withdrawal activity. Results are filtered to exclude periods when BSC chain availability indicates network issues.

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

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

opBNB

Bridge deposits

Bridge deposits

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Chain breakdown