If the Developer Portal shows your live application as NOT enabled for trading, the application is read-only. Order placement returns HTTP 403, while reading data (for example balances, positions and prices) still works.
In October 2026, as part of our enhanced security measures, live personal applications that had not been used for trading recently were set to read-only.
A read-only application can't be changed to a trading application. To place orders, create a new live application with trading enabled on the Developer Portal, and log in with it.
More Resources