@rhino.fi/client-js/src/api/eth/getGasPrice.js

/**
 * Provides a gas price
 */
const recommendedGasPrice = dvf => {
  return dvf.recommendedGasPrices
    ? parseFloat(dvf.recommendedGasPrices.fast) * 1.02
    : false
}

module.exports = async dvf => {
  return dvf.config.gasStationApiKey
    ? await dvf.eth.getGasStationPrice()
    : recommendedGasPrice(dvf) || dvf.config.defaultGasPrice
}