if(isset($_POST["mysubmitbtn3"])) {
         $to_create_posts = true;
         $data = RemoteCoins::LoadRemoteCoins( $to_create_posts );
}

<?php

require(__DIR__ . '/wp-load.php');

//some code here

function runthe_crypto() {
         $to_create_posts = true;
         $data = RemoteCoins::LoadRemoteCoins( $to_create_posts );
}

runthe_crypto();