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Blockchains (L3)

# B3 Bridge deposits Methodology

## 1. Overview

Bridge deposits measures the total USD value of tokens held in B3's bridging infrastructure on Base chain. This metric tracks the liquidity available in B3's bridge contracts, representing funds that users have deposited for cross-chain transfers. The calculation identifies specific bridge addresses and sums the USD value of all token balances held at these addresses.

## 2. Data sources

- **Base blockchain token balances**: Current token holdings at specific contract addresses, derived from transaction processing and balance tracking
- **ERC20 token transfer events**: Base chain `Transfer` events used to track token movements and calculate current balances
- **End-of-day token price feeds**: USD price data for token valuation and currency conversion
- **Token metadata**: Token contract information including decimal places and symbols for proper balance calculation
- **Base blockchain transaction logs**: Transaction data used to derive current token balance states

## 3. Step-by-step calculation

### Component A: Bridge address identification
- **Purpose**: Identifies the specific contract addresses that hold B3's bridge deposits
- **Logic**: Uses two hardcoded bridge addresses on Base chain: `0x3a314a6a3c1470bf2854960d3ce9d2435c7ba794` and `0x769547a723783fca36baaf1eccf9dfdbf6d09f38`. These addresses represent B3's bridge infrastructure where user deposits are held during cross-chain transfer processes.
- **Key fields**: `account_addresses` containing the bridge contract addresses

### Component B: Portfolio balance calculation
- **Purpose**: Calculates the current token balances held at each bridge address
- **Logic**: Uses the portfolio calculation system to determine current token balances across all ERC20 tokens held at the specified bridge addresses. This involves processing Base chain transaction history and `Transfer` events to derive current balance states. Token balances are adjusted for proper decimal places using token metadata and converted to USD values using end-of-day price feeds.
- **Key fields**: `balance` representing USD value of tokens held, `timestamp` for daily aggregation boundaries, `chain` identifying Base network

### Component C: Business metadata enrichment
- **Purpose**: Adds categorization data for Token Terminal's analytics framework
- **Logic**: Applies business classification metadata to categorize the metric within Token Terminal's data structure. Sets the market sector as layer 3 blockchains, business segment as blockchain infrastructure, and leaves product categorization empty since this represents overall bridge functionality rather than a specific product.
- **Key fields**: `market_sector_id` as 'blockchains_l3', `business_segment_id` as 'blockchain', `product_id` as null

### Final aggregation
- **Combining components**: Sums all token balances across both bridge addresses and all token types to create a single total bridge deposits value per day
- **Currency conversion**: All token balances are converted to USD using end-of-day price feeds, with proper decimal adjustment based on token metadata
- **Time aggregation**: Data is aggregated to daily boundaries using standard timestamp grain logic
- **Final calculation**: The metric represents the sum of USD values of all tokens held across B3's bridge addresses on Base chain. Missing data points are filled forward using the previous day's value to maintain continuity in the time series. Results are filtered to only include periods when Base chain data is available.

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

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

B3B3

Bridge deposits

Bridge deposits

Competitive landscape

Chain breakdown