# Fathom DEX Tradeable pairs Methodology

## 1. Overview

Tradeable pairs measures the total number of unique asset pairs available for trading on Fathom DEX. Each pair represents a distinct liquidity pool created via the protocol's factory infrastructure, facilitating direct swap routes between two specific assets. This metric serves as an indicator of the exchange's market breadth and the variety of trading options available to users.

## 2. Data sources

- **Blockchain events**: `PairCreated` events from `Factory` contracts, covering XDC Network
- **External data**: Asset metadata for symbol identification and decimal normalization

## 3. Step-by-step calculation

### Component A: Liquidity pool identification

- **Purpose**: Identify and categorize new trading pairs as they are deployed on the protocol
- **Logic**: `PairCreated` events are parsed from `Factory` contracts. The unique contract address of the new liquidity pool is extracted along with the addresses of the two constituent assets. A fee tier of 0.3% is applied to these pairs based on the factory configuration. Asset metadata is joined to the event data to associate each pool address with its corresponding asset symbols and decimal precision.
- **Key fields**: `pair` (account address), `token0`, `token1`, `fee_tier`

### Component B: Daily new pair tracking

- **Purpose**: Determine the date of inception for every trading pair to enable temporal analysis
- **Logic**: The first appearance of each unique pair address is identified by selecting the minimum timestamp associated with the pool's creation event. These first appearances are then aggregated to produce a count of new pairs created during each UTC day.
- **Key fields**: `block_timestamp`, `account_address`

### Component C: Cumulative aggregation

- **Purpose**: Calculate the total inventory of tradeable pairs available on any given date
- **Logic**: A running total of new pair counts is calculated chronologically to determine the cumulative number of tradeable pairs. The time series is processed to ensure continuity by filling days with no new deployments with zero values. The final dataset is filtered to align with the verified data availability for the XDC Network.

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

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

Tradeable pairs

Exchanges (DEX)