4. What does ‘usage’ mean for the Open-API? July 01, 2021 04:00 Updated Usage for an API key defines the entire functionality that can be accessed using the same API key. Related articles 5. Can I request for additional Usage? 3. Do I need to apply beforehand or submit documentation to create an API? 1. What fees does ADDX charge issuers? 7. Why do I need confirm that I have an authentication method in place? 6. Why do I need to provide my IP address? Comments 0 comments Please sign in to leave a comment.