Is it possible to Filter entry types via the URL?
Yes, it is possible.

Pass the entry type handle to a segment and access that segment using the craft.request getSegment() method. Use this segment variable with the craft.entries .type() method to fetch only the entries of the given type. The example below assumes your entry type handle is in segment 2.

{% set entries = craft.entries.section('pages').type(craft.request.getSegment(2)) %}

{% for entry in entries %}
    &lt;li&gt;{{ entry.title }}&lt;/li&gt;
{% endfor %}