# Functions
CalculateUsdPerUnitGas returns: (sourceGasPrice * usdPerFeeCoin) / 1e18.
Deviates checks if x1 and x2 deviates based on the provided ppb (parts per billion) ppb is calculated based on the smaller value of the two e.g, if x1 > x2, deviation_parts_per_billion = ((x1 - x2) / x2) * 1e9.