FAQ

What is Claudin.io, exactly?

An API proxy for AI coding agents. You pay a flat monthly subscription and get an OpenAI/Anthropic-compatible API key you can drop into Claude Code, Kilo, Zed, Codex, Cursor, or any OpenAI client. No per-token billing.

Is it really unlimited?

Usage is unlimited — there's no request counter or token meter. The only limit is a spend-protection cap per time window that stops a runaway agent from draining your plan. In normal interactive work you rarely hit it. See Plans & limits.

What model do I use?

Always claudinio (or claudinio/claudinio for clients that want provider/model form). The base URL is https://api.claudin.io.

Do I authenticate with Authorization or x-api-key?

Either works. Authorization: Bearer YOUR_API_KEY or x-api-key: YOUR_API_KEY.

Can I use it with a tool that isn't listed?

Yes — any tool that lets you set a custom OpenAI base URL works. Use the generic OpenAI setup.

Does it support tool / function calling?

Yes. That's why it works inside agentic editors. Pass tools and read tool_calls like with the OpenAI API.

Can it handle images, audio, or video?

Yes, transparently. Send standard OpenAI content blocks; the proxy converts images/audio/video to text descriptions or transcriptions before the model sees them. Nothing special to configure.

What's the context window?

256K tokens.

How do I upgrade or cancel?

From your dashboard. Upgrades apply immediately (via Stripe). If you cancel, you keep your paid plan until the end of the period you already paid for, then drop to Free automatically.

I hit a budget error. What now?

You reached the current window's spend-protection cap. Either wait for the window to reset (your dashboard shows when) or upgrade for a bigger cap.

A request failed with 401.

Your key is missing or wrong. Re-copy it from the dashboard and make sure there's no extra whitespace, and that the auth header is set.

My key leaked. What do I do?

Revoke it from the dashboard and generate a new one immediately. Treat keys like passwords — never commit them or share them publicly.

Where do I get help?

Open a ticket from the Support card in your dashboard, or email support. We'll get back to you.