Step-by-Step Guide: How to Use Nebula Block’s Free DeepSeek API for Custom AI Roleplay on Chub AI

If you’ve ever used Chub AI to build characters or chat with AI personalities, you know how captivating it can be — but also how fast usage limits and paid tokens can get in the way.

That’s why this guide exists.

With Nebula Block’s free, OpenAI-compatible API, especially by the DeepSeek models, you can run your Chub AI sessions smoothly and for free — no hosting and complicated setup.

Let’s dive into how to connect Chub AI with Nebula Block’s Free API, so you can enjoy long, expressive conversations without worrying about limits.

What Is Chub AI?

Chub AI is a popular platform for building and chatting with custom AI characters, from friendly companions and mentors to creative roleplay personas.
It’s designed for personalized storytelling, giving users full control over a character’s traits, backstory, and conversation style.

Unlike traditional chatbots, Chub AI emphasizes immersion and emotional consistency, making it a go-to tool for roleplayers, writers, and AI enthusiasts who love narrative-driven experiences.

However, to power these characters, Chub AI needs a compatible inference API — and that’s where Nebula Block steps in.

Why Use Nebula Block’s Free API?

The Free DeepSeek API gives you access to advanced large language models like DeepSeek-R1, DeepSeek-V3 or DeepSeek-R1-0528, built for conversational depth and creativity.

Here’s why it’s perfect for Chub AI:

Important: To get free access to DeepSeek and other mini models, please upgrade to Engineer Tier 2 by adding your credit card (no charge) or deposit $10.

Step-by-Step Guide

Step 1: Get Your API Key

1. Visit Nebulablock.com
2. Sign up for a free account.
3. Go to your API Keys section and save it
4. Copy your new key — it’ll look like sk-xxxx....

💡 You’ll receive free daily API credits automatically — enough for hours of conversation and experimentation.

Step 2: Choose the Model

Nebula Block currently provides multiple models under its Free API tier, and the most popular for Chub AI users is:

• Model name: deepseek-ai/DeepSeek-V3-0324-Free
• Strengths: Emotionally rich responses, creative storytelling, and consistent persona memory.

This model is a strong alternative to traditional GPT-based systems, balancing both expressiveness and reasoning stability, which makes it perfect for AI roleplay sessions.

Step 3: Connect Nebula Block API to Chub AI

1. Open Chub AI and select Character (or create your own character)
2. Settings → Secret

3. Choose OpenAI -> Reverse Proxy.

• Proxy: https://inference.nebulablock.com/v1
• Key: paste the API key you have copied from Step 1

4. Check Proxy

5. Close the tab and back to Configuration:

6. Choose Prompt Structure -> Select model

• You can choose some free models like DeepSeek-R1, DeepSeek-V3-0324 and more

7. Save Settings

That’s all you need, your Chub AI is now connected to Nebula Block’s inference engine.

Note: If you dont see DeepSeek models in models dropdown, reload the page.

Step 4: Test It Out

Now, open your favorite Chub AI character and start a new conversation.
Try creative prompts like:

• “Tell me about our last adventure together, in detail.”
• “Describe this world as if you were my guide and friend.”
• “Stay in role no matter what I say — you remember our shared past.”
• “Speak like a wanderer who’s seen everything but still believes in magic.”

You’ll instantly feel the difference — DeepSeek gives your character smoother tone, emotional nuance, and faster replies.

Pro Tip: If you’re experiencing slow response times or blocked requests, try switching to other models like DeepSeek-R1 or DeepSeek-R1-0528

Tips for a More Realistic Roleplay

• Set temperature between 0.7–0.9 for creative, expressive responses.
• Keep your chat logs, this helps your characters evolve naturally over time.
• Experiment with tone (e.g., poetic, humorous, mentor-like), DeepSeek-V3-0324 adapts remarkably well.
• Use system prompts like:

“You are a sentient being who remembers past interactions, speaks naturally, and adapts emotionally.”

Built for Storytellers and Roleplayers

If you use AI as a co-writer, roleplay partner, or emotional mirror, DeepSeek models deliver the perfect balance of structure and creativity. Its responses flow naturally, maintain emotional context, and stay in character over long sessions.

With Nebula Block’s free models and plug-and-play setup, you can bring your fictional worlds to life without worrying about cost or complexity.

It’s like having a full creative studio in your browser — fast, free, and made for experimentation.

Conclusion

If you’ve ever wanted to build immersive AI roleplays without paying for APIs or running complex servers, this setup is your answer.

With Nebula Block’s Free API (DeepSeek and some mini models), you can instantly plug into Chub AI, Janitor AI or SillyTavern to create deep, consistent, and emotionally rich conversations — all for free.

No barriers, no limits — just creativity and connection.

What’s Next?

Sign up and explore now.

🔍 Learn more: Visit our blog and documents for more insights or schedule a demo to optimize your search solutions.

📬 Get in touch: Join our Discord community for help or Contact Us.

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