Use Guzzle in a Craft CMS twig template. No need for a plugin!

craft-guzzle.twig

{# Create Guzzle instance #}
{% set client = create({
    'class': 'GuzzleHttp\\Client'
}) %}

{# Send API request #}
{% set response = client.request('GET', 'https://jsonplaceholder.typicode.com/posts') %}

{# Check the response status #}
{% set status = response.getStatusCode() %}

{# If the status is OK #}
{% if status == 200 %}

    {# Decode the response contents #}
    {% set posts = response.getBody().getContents() | json_decode %}

    {# Loop through the content #}
    <ul>
        {% for post in posts %}
            <li>{{ post.title }}</li>
        {% endfor %}
    </ul>

{% endif %}