I'm creating a widget to embed from outside of wordpress that will contain the post content. I don't want to use the permalink because that will include the whole page. I'm thinking I can grab the post id, but not sure how to call the url of only the post content from outside of wordpress.
This is not a built-in feature, but if you install the Show Content Only plugin into WordPress, this functionality will be available - simply add:
... to the end of the post URL to get the content only.