Environments

Top Billing has one environment: live. Keys start with tb_live_, every request is served by the model you name, and it is charged to the project's wallet at the published price. There is no sandbox.

• New accounts and new projects start with zero credit. Add credit under Billing by topping up, or redeem a promo code.
• The Playground also runs on live and spends live credits.
• The earlier tb_test_ keys have been retired; the gateway refuses them. Create a live key under API keys.

The dashboard, Usage and Billing pages show this one wallet and its requests. Requests made in the retired test environment stay out of those views.