Cache a number of responses from external json feeds?

$body = get_transient( 'my_api_response_value' );

if ( false === $body ) 
{
    $url="https://api.myapi.com/chart?ticker=" . $ticker . '';
    $response = wp_remote_get($url);

    if (200 !== wp_remote_retrieve_response_code($response)) {
        return;
    }

    $body = wp_remote_retrieve_body($response);
    set_transient( 'my_api_response_value', $body, 5*MINUTE_IN_SECONDS );
}

$formatted_json = json_decode($body, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);

We submit a request at the beginning because the transient doesn’t yet exist, and then we save the $body as a transitory value.

More info about the transient go to this Link : https://developer.wordpress.org/reference/functions/set_transient/