展示HN：我仅使用ChatGPT构建了一个欧盟增值税API
我并不是因为商业需求而开始这个项目。
我只是想看看如果仅使用ChatGPT和AI工具，能把一个“真正的”SaaS做得多远。<p>结果是Vatify：一个欧盟增值税验证和计算API。
它可以：
– 验证增值税号码（VIES查询）
– 返回欧盟国家的增值税税率
– 计算发票（净额/毛额，B2B/B2C，减免税率等）<p>我不确定这是否算得上一个真正的商业项目（有竞争对手，SEO进展缓慢），但我学到了很多：
– 大部分后端和接口都是来自ChatGPT
– 甚至文档、着陆页和logo都是AI辅助生成的
– 最难的部分不是编码，而是弄清楚如何让它对他人有用<p>演示链接：[<a href="https://vatifytax.app" rel="nofollow">https://vatifytax.app</a>](https://vatifytax.app)<p>我很想听听HN的反馈：
– 作为一个细分市场，这是否足够有趣？
– 你会信任这样的小工具吗，而不是更大的竞争者？
– 有什么建议可以找到第一批真实用户吗？<p>即使这并没有变成一个商业项目，这也是一次有趣的实验。我很好奇这里有没有其他人尝试过像这样的“AI优先”SaaS构建？
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I didn’t start this project because of a business need.
I just wanted to see how far I could get if I tried to build a “real” SaaS using only ChatGPT and AI tools.<p>The result is Vatify: an EU VAT validation & calculation API.
It can:
– Validate VAT numbers (VIES lookup)
– Return VAT rates for EU countries
– Calculate invoices (net/gross, B2B/B2C, reduced rates, etc.)<p>I’m not sure if this is a real business yet (there are competitors, and SEO is slow), but I learned a lot:
– Most of the backend and endpoints came from ChatGPT
– Even the docs, landing page, and logo were AI-assisted
– The hardest part was not coding, but figuring out how to make it useful for others<p>Demo: [<a href="https://vatifytax.app" rel="nofollow">https://vatifytax.app</a>](<a href="https://vatifytax.app" rel="nofollow">https://vatifytax.app</a>)<p>I’d love feedback from HN:
– Is this interesting enough as a niche?
– Would you trust a small tool like this vs. bigger incumbents?
– Any ideas where to find the first real users?<p>Even if it doesn’t turn into a business, it was a fun experiment. Curious if anyone else here has tried building a SaaS “AI-first” like this?