> ## Documentation Index > Fetch the complete documentation index at: https://docs.weflayr.com/llms.txt > Use this file to discover all available pages before exploring further. # Credits > The prepaid balance your gateway calls and benchmarks are paid from. Credits are shared by every project of your organization. Open them from the balance at the bottom of the sidebar. Credits page with the available balance, auto top-up and invoices * **Top up credits** to add to the balance, paid by card. * **Auto top-up** adds credits whenever the balance falls below the amount you set, so your calls never stop. * **Invoices** lists every top-up, sent to the billing email you choose. When the balance is empty, the gateway answers `402 insufficient_credits` (see [Errors](/api/introduction#errors)). This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.