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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 | 25x 25x 25x 25x 6x 6x 5x 4x 1x | /**
* Copyright (c) 2018-present, Leap DAO (leapdao.org)
*
* This source code is licensed under the Mozilla Public License Version 2.0
* found in the LICENSE file in the root directory of this source tree.
*/
const axios = require('axios');
const GAS_STATION_API = 'https://ethgasstation.info/json/ethgasAPI.json';
const MAX_GAS_PRICE = 200 * 10 ** 9; // 200 gwei
/**
* Reads proposed gas price from the ethgasstation API for mainnet. For other
* networks returns `null`.
*
* Default price urgency is "fast" (block in < 2 min).
* Other options are: safeLow, average, fastest
*
* Maximum gas price is capped to 200 gwei.
*/
module.exports = async function getRootGasPrice(web3, urgency = 'fast') {
const networkId = await web3.eth.net.getId();
if (networkId !== 1) return null;
return axios
.get(GAS_STATION_API)
.then(response => {
return Math.min(MAX_GAS_PRICE, (response.data[urgency] * 10 ** 9) / 10);
})
.catch(e => {
throw new Error('Gas Station error', e);
});
};
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