Zro Review (2026): Pricing, Features & Honest Verdict

Zro in 30 seconds

Zro is a private inference API built for coding agents. It serves open-weight models from EU-only data centers with zero request retention, and it drops straight into Claude Code, Cursor, Codex, and Cline through OpenAI and Anthropic compatible endpoints. Our verdict: a sharp answer for teams that cannot send proprietary code to US clouds. Best for privacy-bound and EU dev teams. Price: from $20/mo, no free plan. Rating: 7.5/10.

What is Zro?

Zro is an inference endpoint for open-weight large language models, made by a company called MoonMath and hosted at inference.moonmath.ai. The pitch is narrow and deliberate. Coding agents like Cursor and Claude Code are now reading and writing your entire codebase, and every request ships that code to whatever model provider sits behind the tool. For a lot of companies that is a compliance problem. Zro exists to be the provider that does not keep your data and does not run in the United States.

It launched on Product Hunt in July 2026 and leaned hard into two claims: privacy and speed. The infrastructure runs only in the EU, currently Finland and France, which gives it a clean data-residency story for GDPR-sensitive buyers. On top of that it is tuned specifically for coding workloads rather than general chat, with custom attention kernels and a compression layer aimed at long, multi-turn sessions where an agent keeps a big context window open for an hour.

What Are Zro’s Key Features?

Zero request retention

By default Zro does not retain your prompt or completion bodies after inference. No training, no fine-tuning, no evals, no analytics dataset, no quiet log of your source code sitting on someone else’s disk. This is the whole reason the product exists, and they state it plainly rather than burying it in a privacy policy. For a team that has been told it cannot use a US inference API, this is the line that matters.

EU-only infrastructure

Every request is served from EU data centers, currently Finland and France. That is a real differentiator, not marketing dressing. Data residency is a hard requirement for a lot of European companies and public-sector work, and most of the popular inference providers run primarily in the US. Zro turns a compliance blocker into a checkbox you can actually tick.

Drop-in agent compatibility

Zro exposes both OpenAI-compatible and Anthropic-compatible APIs plus an npm package, with documented setups for Claude Code, Codex, Cursor, Cline, and OpenCode. In practice that means you change a base URL and a key rather than rewrite your tooling. Low switching cost is the thing that makes an inference startup actually get tried, and Zro clearly understands that.

Coding-tuned performance

Zro uses what it calls HyperQuant compression and custom attention kernels, built for streaming and long-context sessions. The claim is that coding agents behave differently from chatbots: they hold huge contexts and fire many turns quickly, so the serving stack is optimized for that shape of load rather than one-off prompts. We could not benchmark this independently, so treat the speed claims as unproven until you test on your own workload.

How Much Does Zro Cost?

Zro starts at $20 a month, and that subscription includes $60 of inference spend that resets monthly. There is also a usage-pack option with no subscription, where you prepay for credit that expires after 90 days. There is no free plan and no free trial.

The $20-for-$60 framing is generous on paper but confusing in practice, because the site does not publish clear per-token rates for each model. Without those numbers you cannot easily compare Zro against OpenRouter, Together AI, or Fireworks, which all publish per-million-token pricing openly. Our advice: run a real week of agent usage on a usage pack first and measure what $60 of credit actually buys you before you commit to the monthly plan.

Who Is Zro Best For?

Use Zro if you run coding agents and you have a hard rule against sending code to US model providers, or a data-residency requirement that forces EU hosting. That is a genuine, underserved need, and Zro is one of very few products aimed squarely at it. The drop-in compatibility means adopting it costs you an afternoon, not a migration project.

Skip Zro if you just want the cheapest or fastest inference and privacy is not a constraint. In that case OpenRouter or Together will give you a bigger model catalog and clearer pricing. Also skip it for now if you depend on a specific frontier model, because Zro’s live catalog is small and several models are still marked coming soon.

What Are the Best Zro Alternatives?

OpenRouter is the obvious comparison for open-weight inference. It offers a huge model catalog and transparent per-token pricing, but it routes across many providers, so it is not a single private EU endpoint. If privacy is not your driver, it is the easier default.

Together AI serves open models at scale with published pricing and strong performance. It is a mature, well-funded option, but it is US-centric, which is exactly the gap Zro is targeting.

Mistral La Plateforme is the closest on the EU-privacy angle, since Mistral is a European company hosting European models. If you want EU inference and are happy on Mistral’s own models, it is a serious alternative with a bigger track record than MoonMath.

Final Verdict: Is Zro Worth It?

Zro is doing something smart by picking a fight it can win. Instead of trying to out-scale Together or undercut OpenRouter, it owns the one thing those providers cannot easily offer: private, EU-hosted inference with zero retention, tuned for the exact workload that is leaking the most sensitive data right now. The transparent starting price and drop-in compatibility make it easy to try, which is more than most inference startups manage.

What holds it back is maturity. The model catalog is thin today, the most interesting models are still coming soon, there is no free tier to lower the first-try barrier, and MoonMath is a small vendor whose uptime and scale are unproven against much larger incumbents. If EU privacy is a hard requirement for you, Zro is worth a paid test this week. If it is not, wait for the catalog to fill out. We rate it 7.5/10.