Go Ethereum (Geth) calculates gas prices. weiWard uses Geth to establish a 1-day moving median to assign a gas price to ETHtx.
Using a 1-day moving median has the effect of smoothing ETHtx gas prices, front-running certain attack vectors, providing users with ample opportunities to buy and sell at desirable times, and qualifying ETH gas prices as sustained, systemic increases/decreases in demand for blockspace on the Ethereum blockchain.