const gasTracker = new GasTracker();

gasTracker
    .getBlockchain(BlockchainType.BITCOIN)
    .getPrices()
    .then((result: BitcoinResult) => {
        console.log(result.getRegularPrice());
    })
    .catch((error: any) => {
        console.log(error.message);
    });

try {
    const gasTracker = new GasTracker('YOUR_API_TOKEN');

    const result = (await gasTracker
        .getBlockchain(BlockchainType.ETHEREUM)
        .getPrices()
    ) as EthereumResult;

    console.log(result.getFastPrice());
} catch (error) {
    console.log(error.message);
}