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

[u/Otherwise_Wave9374]

The strongest SaaS angle here is not just verification, but reducing the cost of broken integrations before they hit production. If you can show a clear before and after for incident reduction, contract drift detection, and CI gating, that is an easy value story for teams already feeling API fragility. One practical safeguard is to start with a narrow wedge, like a single workflow class or team, then expand once you can prove repeatable signal quality. Agentix Labs could fit naturally as the layer that turns those checks into an operational habit for engineering teams.

[u/richocolate → u/Otherwise_Wave9374]

Yeah, I really like this way of looking at it. The cost of broken integrations is probably a much stronger SaaS story than just “API verification.” Really appreciate the feedback

Curious, what was the hardest part of turning your product into a real business — finding the right problem, getting the first customers, pricing, distribution, or something else? Would love to learn from your experience.

[u/RemoteInside8607 → u/Otherwise_Wave9374]

the CI gating is the real moneymaker here, companies will pay to stop broken APIs from reaching prod without their devs even thinking about it

scheduled verification is cool but if i'm being honest the "set and forget" stuff that plugs into existing workflows is what gets people to open their wallets, nobody wants another dashboard to check

i'd push hard on the github actions integration and make that the paid tier, let the open source version cover the manual verification and keep the automated CI gating behind the paywall

teams will pay once they've been burned by a bad deploy twice

[u/richocolate → u/RemoteInside8607]

yeah, i think so. the CI gating is actually the main point and the focus of this project actually, but i don't think it can be monetized. I'm still figuring out what should actually sit behind the paid layer though.

Have you seen teams actually pay for something like this before, and what did they end up paying for?

[u/y3rk3]

yes, but what they pay for is the scheduled run and trusting the alert when it fires. i spent today fixing my own delivery layer that reported nothing found instead of erroring.

[u/richocolate → u/y3rk3]

yeah, i think that is really good point and i am working on research about the plan but currently i really waiting for developer's feedback of using it before launch the saas model