AI code editors like Cursor, Roo Code, and Cline are powerful — but their built-in pricing can add up. Most of these tools support "bring your own key" (BYOK), letting you route API calls through your own endpoint. Here's how to set up each tool with a custom API gateway. Why BYOK? Cost control : Pay per token instead of flat subscriptions Model flexibility : Switch between Claude, GPT, and Gemini without changing tools No rate limits : Your usage, your limits Unified billing : One dashboard for all model costs Cursor Cursor supports custom API endpoints through its settings: Open Settings → Models Under OpenAI API Key , enter your gateway key Set OpenAI API Base to your gateway URL: https://futurmix.ai/v1 Enter fullscreen mode Exit fullscreen mode Select your preferred model from the dropdown Now Cursor routes all AI requests through your gateway.…