Thanks for trying! The Hermes template uses the open-source Hermes Agent by Nous Research. You can connect your own model provider and API key.
The free tier includes up to 3 agents. We cover the infrastructure, but users pay for their own LLM usage after the initial $5 credit expires. Since agents sleep when idle and only consume compute while running, the cost of maintaining inactive agents is extremely low. Paid customers running agents at scale subsidize the free developer tier.