The Early Adopter Preview in May that allowed users to directly call a REST endpoint from an Azure SQL Database is now being upgraded to Public Preview.
I'm thrilled that as of right now, everyone may use the new system stored procedure sp invoke external rest endpoint automatically and transparently from any Azure SQL Database they may already have or create in the future.
Feedback for SQL Query:
https://feedback.azure.com/d365community/forum/04fe6ee0-3b25-ec11-b6e6-000d3a4f0da0