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Blockchains (L3)

# XAI Bridge deposits Methodology

## 1. Overview

Bridge deposits for XAI represents the total USD value of tokens held in designated bridge contract addresses on Arbitrum. This metric tracks the aggregate value locked in XAI's bridging infrastructure, providing insight into the capital flowing through their Layer 3 bridge system. The calculation aggregates token balances across all specified bridge addresses and converts them to USD using end-of-day pricing.

## 2. Data sources

The bridge deposits calculation relies on several key data sources:

- **Arbitrum token transfer events**: Parsed ERC20 `Transfer` events from Arbitrum showing token movements to and from bridge addresses
- **Arbitrum native token balance changes**: Native ETH balance changes on Arbitrum for the bridge addresses  
- **Token metadata**: Token contract information including decimal places and symbols for proper amount normalization
- **End-of-day price feeds**: Daily token price data in USD for converting token balances to dollar values
- **Chain availability data**: Arbitrum network operational status to filter out periods when the chain was not functioning properly

## 3. Step-by-step calculation

### Component A: Bridge address portfolio tracking
- **Purpose**: Calculate current token balances held across XAI's designated bridge addresses
- **Logic**: The system tracks two specific Arbitrum addresses (`0xb591ce747cf19cf30e11d656eb94134f523a9e77` and `0x7dd8a76bdaebe3bbbacd7aa87f1d4fda1e60f94f`) that serve as XAI's bridge deposit contracts. For each address, the calculation processes all incoming and outgoing token transfer events to determine net token holdings. This includes both ERC20 token transfers and native ETH balance changes. Token amounts are normalized using each token's decimal specification to convert from raw blockchain units to standard token units.
- **Key fields**: The `balance` field represents the token amount held by each address for each specific token, normalized to standard decimal places

### Component B: USD conversion and aggregation  
- **Purpose**: Convert token balances to USD values and aggregate across all bridge addresses
- **Logic**: Each token balance is converted to USD using end-of-day price feeds matched by token contract address and date. The system applies price conversion to the normalized token amounts to calculate USD equivalent values. All USD values are then summed across both bridge addresses and all tokens held to produce a single aggregate bridge deposits value per day.
- **Key fields**: The `bridge_deposits` field contains the total USD value of all tokens held across the bridge addresses

### Component C: Business classification and metadata
- **Purpose**: Apply business context and classification to the metric data
- **Logic**: The metric is classified with business metadata including `market_sector_id` set to 'blockchains_l3' indicating this tracks a Layer 3 blockchain solution, and `business_segment_id` set to 'blockchain' for the core blockchain business segment. The `chain_id` field specifies 'arbitrum' as the underlying blockchain. No specific `product_id` is assigned as this represents overall bridge deposits rather than a specific product.
- **Key fields**: Business classification fields provide context for how this metric fits within Token Terminal's taxonomy

### Final aggregation
- **Combining components**: Token balances are summed across all tokens and both bridge addresses to create a single daily bridge deposits value. The USD conversion happens before aggregation to ensure accurate cross-token summation.
- **Currency conversion**: All token balances are converted to USD using end-of-day price feeds, with conversion applied after decimal normalization but before final aggregation
- **Time aggregation**: Daily time boundaries are used with forward-fill strategy applied to maintain continuity in the time series for dates with missing data
- **Final calculation**: The final bridge deposits value represents the total USD equivalent of all tokens (ERC20 and native) held across XAI's two designated bridge addresses on Arbitrum, calculated as the sum of each token balance multiplied by its end-of-day USD price, filtered for chain availability and capped at August 22, 2025

*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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