How to save an array with one metakey in postmeta?

You don’t need to loop through the values. Just use update_post_meta($post_ID, {key}, {array of vals}), it should do!

<?php
$poddata = Array(
    'pod_id' => $this->pod_id,
    'url' => $this->url,
    'name' => $this->name,
    'description' => $this->description,
    'service' => $this->service,
    'status' =>$this->status,
    'price' => $this->price
    );

//Update inserts a new entry if it doesn't exist, updates otherwise
update_post_meta($post_ID, 'poddata', $poddata);
?>

Thats it! When you fetch it for usage, do the following:

    $poddata = get_post_meta($post_ID, 'poddata');

$poddata is the array of values.