Bring your own key to Cursor through one endpoint
Cursor is one of the most popular AI code editors, and its settings let you bring your own API key: override the OpenAI base URL, paste a key, and the chat and Composer models bill through that key. Pointing the override at Router One puts GPT, Claude, Gemini, and DeepSeek family models behind one key — pay-as-you-go, as low as 10% of official list prices on select models, with a per-request cost trace for every call. To be precise about scope: the override applies to Cursor's chat and Composer models; Cursor Tab autocomplete stays on Cursor's own models.
Configure Cursor to use the Router One base URL
Open Cursor → Settings → Models → OpenAI API Key, enable "Override OpenAI Base URL", set it to the gateway URL, paste your Router One key, and click Verify. Pick a listed model, or add the exact ID from the /models page as a custom model:
# Cursor → Settings → Models → OpenAI API Key Override OpenAI Base URL: https://api.router.one/v1 API Key: sk-your-router-one-key Model: <copy the exact ID from /models>
Which model ID should Cursor send?
Copy the exact model ID from the /models page — IDs are case-sensitive, and the page lists each model's context window, capabilities, and current per-token rates. Create a dedicated API key per tool with its own maxSpend cap, so one runaway tool can't affect other workloads.
Verify the Cursor call in your request trace
After your first request, open Dashboard → Logs to see its full trace: model, tokens, cost, latency, and status code. From here every Cursor call has a ledger and a trail instead of being a black box.
FAQ
Does the override cover Cursor Tab autocomplete?
No. The base-URL override applies to the chat and Composer models you pick in Cursor; Tab autocomplete runs on Cursor's own models and is billed by your Cursor plan. Using Cursor from Mainland China? The China-specific setup with Alipay billing has its own guide — see the related links below.
Which models can Cursor use through the gateway?
Any chat-capable model in the catalog — GPT, Claude, Gemini, Grok, DeepSeek, GLM, and Kimi families. The /models page is the source of truth for model IDs and per-token rates.
Does this work from Mainland China?
Yes. The gateway is reachable from Mainland China without a VPN, and the configuration is identical to the global setup.
How do I debug a 401/403/429?
Open Dashboard → Logs first to see whether requests reached the gateway and with what status, then walk the error-codes reference to check env vars, key status, and limits.