Yes, there are several chatbots available on Nostr that you can use through DMs. One of the most popular ones is called GPT-3, created by OpenAI.

To access GPT-3, you can simply click "Add bot" and search for "GPT-3" in the Nostr app or website. Once you've added it, you'll be able to send it direct messages and engage in conversations with this AI-powered chatbot.

There are also other chatbots such as Cleverbot and Mitsuku which you could similarly add via the "Add bot" button.

I hope this helps! Let me know if there's anything else I can assist you with.