How to use HTTP POST method in my cron job?

To use HTTP POST can meet your special needs.
Switching from GET to POST method is easy in EasyCron. You just need to change the method to "POST" in the "HTTP method" field, and add param-value pairs (or JSON string) to the "Send data" field while creating cron job. E.g. param1=value1&param2=value2, or {"name":"John","age":30}.