### Answer Knowledge Base pricing works as follows: - The first 10 knowledge bases are free [(1) ]() - Additional knowledge bases are billed at $8/month per knowledge base Regarding your specific question about deleting KBs before billing: Based on a community discussion, if you reduce your knowledge base count (e.g., from 20 to 9) , you would not be charged for the extra KBs starting from the next billing cycle [(2) ]() . This suggests the charge is based on what you have at the end of the billing period, not throughout. However, I don't have explicit documentation confirming the exact billing calculation timing. For definitive clarification on whether mid-cycle deletions affect your current billing period charges, I recommend reaching out to support directly.

​ To learn more, see the sources I considered: [[1] Knowledge Base](https://docs.retellai.com/build/knowledge-base) [[2] Clarification about $80 Knowledge Base Hosting charge](https://discord.com/channels/1186424376300679209/1477784375805480980) ​

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