GasPriceAPIClient.js

export class GasPriceAPIClient {
    public async requestGasPrice(): Promise<string> {
        // https://ethgasstation.info/json/ethgasAPI.json
        try {
            const response = await rp("https://ethgasstation.info/json/ethgasAPI.json");
            const { fastest } = JSON.parse(response);
            let fastestInMwei = fastest * 100;
            // 10Gwei ~ 30Gwei 사이의 값으로 설정
            fastestInMwei = _.clamp(fastestInMwei, 10 * 1000, 30 * 1000);
            return toWei(String(_.floor(fastestInMwei)), "Mwei");
        } catch (err) {
            return toWei("20", "Gwei");
        }
    }
}