Cursor
Track usage, control costs, and add guardrails to your Cursor AI editor
What is Cursor?
Cursor is a powerful AI-powered code editor built for pair-programming with AI. It provides chat, inline edits, and agentic coding workflows directly inside the editor, and supports custom OpenAI-compatible endpoints through its model settings.
By routing Cursor through FastRouter, you get:
100+ models from OpenAI, Anthropic, Google, xAI, Meta, Groq, Mistral, and more through one endpoint—including coding models like Grok Code Fast 1
Observability for every request: cost, tokens, latency, and model selection tracked in real time
Reliability through automatic failover across providers, response caching, and intelligent routing
Governance with per-key budgets, rate limits, model restrictions, role-based access, and project isolation
This guide covers configuring Cursor's OpenAI API settings to use FastRouter and adding models from the FastRouter catalog.
Prerequisites
Quick Start
Step 1: Get Your FastRouter API Key
Sign up or log in at fastrouter.ai
Navigate to your project's Keys page
Click Create User Key
Copy the key immediately. FastRouter does not display the key again after creation.
Step 2: Configure the OpenAI Base URL
Open Cursor Settings, go to the Models section, and in the OpenAI API key settings:
Paste your FastRouter API key into the OpenAI API Key field
Enable Override OpenAI Base URL and set it to:
Step 3: Add a Model
Click Add Model and enter a FastRouter model slug, for example:
Step 4: Start Coding
Select the model you added from Cursor's model picker and start a chat or edit. Requests now route through FastRouter, and every request, token count, and cost appears in your FastRouter Dashboard.
Use Cursor with 100+ Models
FastRouter uses the provider/model-name format. Add any model from the catalog the same way—click Add Model and enter the slug:
Check the FastRouter Model Catalog for available models and input modalities (text, image, file).
Automatic Model Selection
Let FastRouter pick the best model for each request based on query complexity, domain, and cost. Add this model identifier:
Explore automatic model selection
FAQs
Configuration & Setup
Can I use multiple models with the same API key?
Yes. The API key controls access and budget. Add as many models as you like in Cursor's settings and switch between them from the model picker—no key changes needed.
Can I restrict a key to only use specific models?
Yes. When creating or editing a key, use the Select Models setting to limit which models the key can access. FastRouter rejects requests to unauthorized models.
My requests fail after setup. What should I check?
Verify the Base URL is exactly https://api.fastrouter.ai/api/v1, the API key is correct, and the model name matches a FastRouter catalog slug exactly (including the provider prefix). Also make sure Cursor is updated to the latest version.
Costs & Budgeting
What happens when a key exceeds its budget?
FastRouter blocks further requests until the budget resets (if a reset interval is configured) or an admin increases the limit.
Privacy & Security
Is my code sent to FastRouter's servers?
FastRouter acts as a pass-through gateway. Requests are routed to the model provider and responses are returned to your client. Content logging can be disabled per key for sensitive workloads. See the Disable Content Logging option in key settings.
Next Steps
Set up Fallback Models for high availability
Configure Alerts for spend and performance monitoring
Run a Free Audit on your existing LLM traffic to identify savings
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