ApexApiApexApi
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Use ApexApi in Cursor

Cursor can talk to ApexApi as a drop-in OpenAI endpoint, giving you every model in our catalog inside the editor, billed to one balance. Setup takes about a minute.

1. Get your API key

Create a key in your dashboard. It starts with ak-.

2. Add the key in Cursor

Open Settings → Cursor Settings → Models → API Keys, enable OpenAI API Key, and paste your ApexApi key.

3. Override the OpenAI Base URL

In the same section, enable Override OpenAI Base URL and enter:

https://api.apexapi.dev/v1

The trailing /v1 matters.

4. Add the models you want

Under Models, click + Add Custom Model and enter an ApexApi model ID in provider/model format, for example:

anthropic/claude-sonnet-4.6
openai/gpt-4o
google/gemini-3.5-flash

The name must match the catalog ID exactly. Browse all IDs on the models page. Enable the model after adding it, then select it from Cursor's model picker in chat.

Troubleshooting

  • 401 Unauthorized: the key wasn't pasted correctly, or the OpenAI key toggle is off.
  • Model not found: the custom model name doesn't match a catalog ID. Copy it verbatim from the models page.
  • Verification fails: make sure the base URL is exactly https://api.apexapi.dev/v1 (no trailing slash after v1) and your balance is positive.
  • Requests hang or error mid-stream: check the error codes reference; streaming and Cursor's request formats are fully supported.