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Introduction : Oracle APEX on Always Free Oracle Autonomous Database provides a preconfigured, fully managed and secured environment to both develop and deploy world-class applications. service remains free for an unlimited time as long as it is used.

API service domain : apex.oracle.com API Documentation : https://docs.oracle.com/en/database/oracle/application-express/19.2/aeapi/index.html

I see that you posted about this in another thread, so I've answered there.