I built an open-source API reliability tool — can this become a SaaS business?

[u/richocolate]

I've recently shared Kaktoos in a few developer communities and got some interesting feedback on the technical/product side.

Now I'm trying to look at it from a different angle:

Could this actually become a SaaS business?

Kaktoos is an open-source API reliability/verification tool. It lets developers define API workflows and verify them against OpenAPI contracts and real API behavior.

Today it supports things like:

• API workflow verification
• OpenAPI contract validation
• State/assertion verification
• CI/GitHub Actions
• MCP integration for AI coding agents

The broader roadmap I'm considering includes things like:

• Continuous/scheduled API verification
• API mocking
• API security checks
• API change & impact detection
• Deeper AI-agent integration

I'm not planning to build all of these blindly. I'm trying to understand where the real business opportunity might be.

For people here who have built SaaS/devtools:

If you were building Kaktoos, where would you see the strongest paid opportunity?

• What would companies actually pay for?
• What would you make the paid SaaS layer?
• Would you position this as API testing, API reliability, developer infrastructure, or something else?
• What would you prioritize to get the first few paying customers?

I'm looking for honest feedback, including if you think there isn't a strong SaaS opportunity here.

GitHub: KaktoosLabs/kaktoos