pricegun

Method

The algorithm is constantly being improved and updated, but is currently based on calculating a modified Time Weighted Average Price as follows

$$P_{\mathrm{TWAP}} = \frac{\sum_{j}{P_j \cdot w_j \cdot V_j^E}}{\sum_{j}{w_j \cdot V_j^E}}$$ $$w_j = e^{-\lambda T_j}$$ $$\lambda = \frac{ln(2)}{H}$$

where

• $P_{\mathrm{TWAP}}$ is the Time Weighted Average Price
• $P_j$ is the price of the item at a given transaction
• $w_j$ is the time weighting coefficient
• $T_j$ is the time since the transaction epoch (now) in seconds
• $H$ is the halflife for transaction weighting (three days) in seconds
• $V_j$ is the volume of a given transaction
• $E$ is a factor for dampening the impact of sudden high volume transactions
• $j$ is the individual transaction

Development

To install dependencies:

yarn

To run:

yarn start