9Router Guide: Free Universal AI Coding Proxy — Connect Claude Code, Codex, Cursor, Cline to 40+ AI Providers with Auto-Fallback

If you use AI coding tools daily, you know the pain: subscription quotas expire mid-month, rate limits interrupt your flow, tool outputs (git diff, grep, ls) burn through tokens fast, and juggling multiple providers is a nightmare.

9Router solves all of this in one elegant package. It's an open-source local proxy server that sits between your AI coding tool and any AI provider, intelligently routing requests, compressing output tokens, and auto-failing over between providers when quotas run dry.

And it's absolutely free — currently trending on GitHub with 8K+ stars and climbing fast.

What Makes 9Router Different?

Most developers stick to one AI provider out of inertia. But the reality is that the AI landscape is fragmented and expensive. 9Router is the first tool to treat all providers as interchangeable resources, routing requests based on what's available and cheapest at that moment.

Your CLI Tool (Claude Code, Codex, Cursor…)
       │
       ▼  http://localhost:20128/v1
   ┌─────────────────────────────┐
   │        9Router              │
   │  • RTK Token Saver (-40%)  │
   │  • Format translation      │
   │  • Quota tracking          │
   │  • Auto token refresh      │
   └──────┬──────────────────────┘
          │
   ├── Tier 1: SUBSCRIPTION (Claude Code, Codex, Copilot)
   │        ↓ quota exhausted
   ├── Tier 2: CHEAP (GLM $0.6/1M, MiniMax $0.2/1M)
   │        ↓ budget reached
   └── Tier 3: FREE (Kiro AI, OpenCode Free, Vertex $300 credits)

Step-by-Step Installation

1. Install via npm

9Router is available as an npm package. Install it globally:

npm install -g 9router

Then start it:

9router

The dashboard opens at http://localhost:20128.

2. Connect a FREE AI Provider

No signup needed. In the dashboard, navigate to Providers and connect:

• Kiro AI — Free Claude Sonnet unlimited usage
• OpenCode Free — No authentication required
• Google Vertex — $300 free credits

3. Configure Your AI Coding Tool

Point any OpenAI-compatible tool to the 9Router endpoint:

# Claude Code, Codex, OpenClaw, Cursor, Cline
Endpoint: http://localhost:20128/v1
API Key: [copy from dashboard]
Model: kr/claude-sonnet-4.5

That's it. You're now coding with FREE AI models routed through intelligent tier management.

RTK: The Token Saver That Actually Works

One of 9Router's most impressive features is the Response Token Killer (RTK). When AI coding tools interact with your terminal, the tool_result content (file listings, grep output, git diffs, build errors) can be enormous. RTK intelligently compresses these outputs before sending them to the LLM, saving 20-40% on tokens per request.

For heavy users generating hundreds of requests per day, this quickly adds up to significant savings — especially on paid tiers where every token costs money.

Auto-Fallback: Never Get Interrupted Again

9Router's three-tier routing system is its killer feature:

This means you never hit a wall mid-session. Even if your Claude Code monthly quota is exhausted on the 15th, 9Router transparently falls back to a cheap or free provider without you having to change a single setting.

Compatible Tools

9Router works with virtually every major AI coding tool out of the box:

• Claude Code — Anthropic's terminal coding agent
• Codex CLI — OpenAI's autonomous coding agent
• Cline — VS Code extension for autonomous coding
• Cursor — AI-first IDE
• Continue — Open-source AI code assistant
• Antigravity — Terminal AI agent wrangler
• Roo — Open-source code agent
• OpenCode — Free terminal coding agent
• Kilo Code — VS Code coding agent
• Droid — Claude Code for Android
• GitHub Copilot — Via OpenAI-compatible endpoint

Running from Source

If you prefer to run from the source repository:

git clone https://github.com/decolua/9router
cd 9router
cp .env.example .env
npm install
PORT=20128 NEXT_PUBLIC_BASE_URL=http://localhost:20128 npm run dev

For production:

npm run build
PORT=20128 HOSTNAME=0.0.0.0 NEXT_PUBLIC_BASE_URL=http://localhost:20128 npm run start

Why 9Router Matters in 2026

The AI coding tool ecosystem is more fragmented than ever. Providers come and go, pricing changes monthly, free tiers get discontinued. Just this year, iFlow, Qwen, and Gemini CLI discontinued their free tiers.

9Router's model of provider abstraction and intelligent routing is forward-looking. Instead of locking yourself into one provider's ecosystem, you get the best of all worlds: use your existing subscriptions, top up with cheap models when you need more, and fall back to free providers when budget is tight.

It's a smart layer that makes the entire AI coding experience more resilient and cost-effective. For solo developers, this can mean the difference between a $50/month bill and effectively $5-10/month. For teams, the savings multiply.

Final Thoughts

9Router isn't flashy — it's practical. It solves a real pain point that every AI-assisted developer faces: the friction between tools, providers, and costs. With 8K+ GitHub stars and trending hard, the community clearly agrees.

If you use any AI coding tool, install 9Router and connect a free provider. You'll wonder how you survived without it.

Tags: 9Router, AI Coding, Claude Code, Codex CLI, Cursor, Cline, GitHub Trending, Developer Tools, Token Optimization, AI Proxy, Open Source, 2026

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