We just added a feature to EasyCron.com. This feature allows user to run cron job manually by clicking on the URL link in the cron job list .
Manually triggered cron job is run from EasyCron's server, so in your website's log, you will still see the IP/agent of EasyCron.com.
In the popped up page of manually-run cron job, you can see statistics information such as start time, connect Time, done time, total execution time, HTTP status code and the output of the cron job. These information will help you check if everything is good with your cron job.
In order to prevent abuse, every user only has a quota of 20 times to manually run the cron jobs in one day.