public function withdrawFee(string $asset)
    {
        $params = [
            "wapi" => true,
        ];

        $response = $this->httpRequest("v3/assetDetail.html", "GET", $params, true);

        if (isset($response['success'], $response['assetDetail'], $response['assetDetail'][$asset]) && $response['success']) {
            return $response['assetDetail'][$asset];
        }
    }