9router/gitbook/content/en/integration/cursor.md

Cursor Integration

Integrate 9Router with Cursor IDE to route your AI requests through 9Router's intelligent routing system.

Prerequisites

• Cursor IDE installed
• Cursor Pro account (required for custom API endpoints)
• 9Router cloud endpoint configured
• API key from 9Router dashboard

⚠️ Important Notes

Cloud Endpoint Required: Cursor routes requests through its own server and does not support localhost endpoints. You must use the 9Router cloud endpoint: https://9router.com

Cursor Pro Required: This feature requires a Cursor Pro account to use custom API endpoints.

Setup

1. Open Cursor Settings

1. Open Cursor IDE
2. Go to Settings (Cmd/Ctrl + ,)
3. Navigate to Models section

2. Enable OpenAI API

1. Find the OpenAI API key option
2. Enable the toggle to activate custom API configuration

3. Configure Base URL

Set the base URL to 9Router cloud endpoint:

https://9router.com

Steps:

1. In the Models settings, locate the Base URL field
2. Enter: https://9router.com
3. Click Save

4. Add API Key

1. In the API Key field, enter your 9Router API key
2. You can find your API key in the 9Router dashboard under Settings → API Keys
3. Click Save

5. Add Custom Model

1. Click View All Models button
2. Click Add Custom Model
3. Enter the model name from your 9Router configuration (e.g., gpt-4, claude-opus-4-5, etc.)
4. Click Add

6. Select Model

1. In the Cursor chat interface, click the model selector dropdown
2. Choose your custom model from the list
3. Start using 9Router with Cursor!

Configuration Example

Your Cursor settings should look like this:

OpenAI API: ✓ Enabled
Base URL: https://9router.com
API Key: sk-9router-xxxxxxxxxxxxx
Custom Models: gpt-4, claude-opus-4-5, gemini-2.0-flash

Available Models

You can use any model configured in your 9Router dashboard. Common examples:

Model Name	Provider	Description
gpt-4	OpenAI	GPT-4 Turbo
gpt-4o	OpenAI	GPT-4 Optimized
claude-opus-4-5	Anthropic	Claude Opus 4.5
claude-sonnet-4-5	Anthropic	Claude Sonnet 4.5
gemini-2.0-flash	Google	Gemini 2.0 Flash

Usage

Chat Interface

1. Open Cursor chat (Cmd/Ctrl + L)
2. Select your model from the dropdown
3. Start chatting with AI through 9Router

Inline Code Generation

1. Select code in your editor
2. Press Cmd/Ctrl + K
3. Enter your prompt
4. Cursor will use 9Router to generate code

Code Explanation

1. Select code in your editor
2. Press Cmd/Ctrl + L
3. Ask "Explain this code"
4. Get AI-powered explanations through 9Router

Troubleshooting

"Invalid API Key" Error

1. Verify your API key in 9Router dashboard
2. Make sure you copied the entire key including the sk-9router- prefix
3. Check that the API key has not expired
4. Try regenerating a new API key

"Model Not Found" Error

1. Verify the model name matches exactly with your 9Router configuration
2. Check that the provider connection is active in 9Router dashboard
3. Ensure the model is available in your connected providers
4. Try using the full model name (e.g., openai/gpt-4 instead of gpt-4)

Connection Issues

1. Verify you are using the cloud endpoint: https://9router.com
2. Check your internet connection
3. Ensure 9Router cloud service is operational
4. Try disabling VPN or proxy if enabled

Localhost Not Working

Remember: Cursor does not support localhost endpoints. You must use the cloud endpoint https://9router.com. If you need to use a local 9Router instance, consider using a tunneling service like ngrok to expose your local endpoint.

Cloud Endpoint Setup

If you're running 9Router locally and want to use it with Cursor:

1. Enable cloud endpoint in 9Router settings
2. Configure your cloud endpoint URL in 9Router dashboard
3. Use the cloud URL in Cursor settings
4. Ensure your local 9Router instance is accessible from the internet

Best Practices

1. Use Model Aliases: Create short aliases for frequently used models in 9Router
2. Monitor Usage: Check 9Router dashboard for usage statistics and costs
3. Rotate API Keys: Regularly rotate your API keys for security
4. Test Models: Try different models to find the best one for your use case