How to Claim Free ZRO API Access for Coding Tools

Hunting for a free API key to point your coding tool at? ZRO gives away free API access on a daily quota, and it works with Claude Code, Cursor, OpenCode, Cline, and other coding tools.

You get DeepSeek V4.1 Flash and GLM-5.3 Flash, with a context window of up to 1 million tokens. The quota resets every day, though the exact daily cap has not been announced.

What You Need

• A coding tool already installed, such as Claude Code, Cursor, OpenCode, or Cline.

Tutorial

1. Open https://zro.moonmath.ai/get-started?plan=free.
2. Sign up for an account and pick the Free plan.
3. Go to Account, then open API Keys.
4. Create a new API key.
5. Configure your coding tool with the API key, model ID, and endpoint. All three values are listed in ZRO.

Wrapping Up

You now have a working ZRO key you can drop into any of the supported coding tools, plus two models to switch between. Since the quota resets daily and the hard limit is not published, treat the first few days as a test and see how far a day of use actually gets you.