### Answer Based on the available documentation, there isn't a built-in feature to set hard spending or usage limits on your Retell AI account. What constraints exist: - **Concurrency limits**: Pay-As-You-Go users have a default quota of 20 concurrent calls. You can upgrade your plan via the Billing page if you need more. [(1) ]() - **Max call duration**: Calls automatically end after 1 hour by default. - **Max prompt token length**: The maximum prompt length when using Retell LLM is 32768 tokens by default. To reduce costs, you can: - Optimize prompt design to be more concise [(2) ]() - Use lower-cost models for simpler tasks If you need custom limits or have specific requirements, the documentation suggests reaching out to [support@retellai.com](support@retellai.com) . [(1) ]()

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.

​ To learn more, see the sources I considered: [[1] Understand concurrency & limits](https://docs.retellai.com/deploy/concurrency) [[2] Any trick to limit the token usage in my account?](https://discord.com/channels/1186424376300679209/1379104582470209607) ​