> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.vapi.ai/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.vapi.ai/_mcp/server.

1. **Purchase Reserved Concurrency and Scale Infinitely**: You can now reserve more concurrent calls with Vapi and scale infinitely by switching to our new top up payment system on the [billing page](https://dashboard.vapi.ai/org/billing). To migrate, click "Switch to Credit Based Billing" and make a payment. Advantages include:

* **Support More Users Without Limits**: You don't need to worry about getting throttled or staying under usage limits on the conversations you can have with Vapi.
* **Predictable Budgets**: You know exactly how much you will spend on Vapi each month, and you can top up at any time as your needs grow.
* **Select Add-Ons You Need**: The credit based billing page allows you to select HIPAA compliance, dedicated Slack support, and the maximum number of concurrent calls you expect.

> **Warning**
>
> This will require human input to login and migrate your account. You will not be able to revert back to the old billing system.