Was it a timeout? I just tested and worked for me, but that is usually big so yes, sometimes there are errors. Things to improve. Also some models cannot handle that much context so after calling getrawmempool or GetBlock, they stop working until you clear the chat with a new one.
The sats are used for paying the LLMs throw the routstr marketplace. But you can configure it to use you own LLM if you prefer by clicking on the right side "Model" button.