Lumen+Guzzle的API调用提供了错误的数组到字符串转换

我想打电话 https://api.binance.com/api/v3/ticker/price 作为一个json对象,我一直 数组到字符串的转换 当我使用json\U解码时。我做错了什么?

<?php namespace App\Helpers;

use GuzzleHttp\Exception\GuzzleException;
use GuzzleHttp\Client;

class Ticker
{
    private $client;

    public function __construct()
    {
        $this->client = new Client(['base_uri' => 'https://api.binance.com/api/']);
    }

    public function update()
    {

        $response = json_decode($this->client->get('v3/ticker/price')->getBody());
        return $response;
    }
}