Is it possible to use satellite data by using an API for the relay with my PC environment?

In principle, depend on each satellite data's date policy.

-Tellus Market
It is prohibited to copy or remove original data outside of Tellus.

-Tellus Traveler
It is permissible to download and use some data after it has been processed as a secondary deliverable.
For details, please refer to the data catalogue of each data.

If you have any requests, please send them via the inquiry form.