Using web hooks json

I’m using a web hook to pull content from my blog into other areas of my site which isn’t wordpress. I’m using code like the below:

<?php if( $latest = @file_get_contents( 'https://www.my-domain.com/my-blog/?wp_hook=get_posts' ) ) : ?>
	<?php $_latest = json_decode( $latest ); ?>
        <ul>
	<?php foreach( $_latest->return as $latest ) : ?>
		<li><?php echo $latest->post_title; ?></li>
	<?php endforeach; ?>
        </ul>
<?php endif; ?>

The url returns the data as a json encoded array. It appears to be working fine. Longer term though are there any performance issues/issues I could encounter pulling data out of my blog this way?