How to access the API once at the specified date and time?

Question

API

To begin with, DO NOT REPEAT the action after a given period of time!
You just need to specify the date and time (preferably with seconds), the command / URL and at the given time the command or url should be pulled. In addition, it should be possible to cancel the task.
Upd: You need to set and cancel tasks not manually, but through the service API.
It is clear that you can implement this bicycle at home, but can anyone advise cloud services that can do this? Naturally, in the case of a service, we will pull only urls.

Answer 1

Here is a cloud service for you - https://cron-job.org/en/