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Fathom

# Fathom Tradeable pairs Methodology

## 1. Overview

The Fathom tradeable pairs metric measures the cumulative number of unique trading pairs available on the Fathom DEX platform over time. This metric tracks the growth of trading pair availability on the decentralized exchange, providing insight into the platform's expanding liquidity options. The calculation aggregates new pair creations daily and maintains a running total to show the platform's trading pair inventory growth.

## 2. Data sources

The metric relies on the following data sources:
- **Blockchain events**: Parsed `Factory_PairCreated_event` logs from the Fathom DEX v2 Factory contract on the XDC blockchain, which are emitted when new trading pairs are created
- **Token metadata**: Token information repository containing symbol names and decimal precision for tokens traded on the platform

## 3. Step-by-step calculation

### Component A: Trading pair extraction
- **Purpose**: Identifies all trading pairs created on the Fathom DEX platform
- **Logic**: Extracts `Factory_PairCreated_event` logs from the Fathom DEX Factory contract on XDC chain. Each event contains the newly created pair contract address, the two token addresses (`token0` and `token1`) that make up the pair, and the block timestamp when the pair was created. The system applies a standard 0.3% fee tier to all pairs (calculated as 3000/10^6). The data is enriched by joining with token metadata to obtain decimal precision and symbol names for both tokens in each pair.
- **Key fields**: `account_address` (pair contract), `token0_address` and `token1_address` (constituent tokens), `block_timestamp` (creation time), `fee_tier` (0.3%), `token0_decimals` and `token1_decimals` (precision), `account_name` (formatted as "TOKEN0-TOKEN1")

### Component B: First appearance tracking
- **Purpose**: Determines the first day each trading pair became available
- **Logic**: Groups all pair creation events by unique pair contract address and finds the minimum block timestamp for each pair, truncated to daily grain. This handles any potential duplicate events or data processing artifacts by ensuring each pair is counted only once on its true creation date. The output creates a record of when each unique trading pair first appeared on the platform.
- **Key fields**: `timestamp` (daily grain), `product_id` ("Fathom DEX"), `chain` ("xdc"), `account_address` (unique pair identifier)

### Component C: Daily aggregation
- **Purpose**: Counts new trading pairs created each day
- **Logic**: Aggregates the first appearances by day, chain, and product using approximate distinct count on pair addresses. This provides a daily count of newly created trading pairs while handling any edge cases where the same pair might appear multiple times in the source data. The approximate distinct count ensures accurate counting even with large datasets.
- **Key fields**: `pair_count` (new pairs per day), aggregated by `timestamp`, `chain`, and `product_id`

### Component D: Gap filling
- **Purpose**: Ensures continuous time series data
- **Logic**: Applies gap-filling logic to create records for days when no new pairs were created, setting the `pair_count` to zero for those days. This ensures the time series has no gaps and provides a complete daily sequence for accurate cumulative calculations.
- **Key fields**: `pair_count` (filled with zeros for missing days)

### Final aggregation
- **Combining components**: The daily pair counts are processed through a cumulative sum calculation
- **Time aggregation**: Data is aggregated on daily boundaries using timestamp truncation
- **Final calculation**: A running sum window function partitioned by chain and product calculates the cumulative total of tradeable pairs over time, ordered by timestamp. This produces the final metric showing the total number of unique trading pairs available on the platform at any given day
- **Standardization**: The final output is processed through standard metric finalization including schema validation, forward-filling any remaining gaps, and applying chain availability filters

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

Number of unique token pairs available for trading on the exchange.

Fathom

Tradeable pairs

Tradeable pairs

Competitive landscape