I recently released an open source library named Grillon. This is an end-to-end HTTP API testing library written in Rust. I started working on the next version when the idea came up : Why not create a SaaS on top of it? I written a blog post about this library if you are interested : https://theredfi.sh/posts/grillon-e2e-http-testing-rust
I'm a big believer in open source, but I also love to create online services. So why not to do both? Plus I have 7 years of experience as a test engineer that will help me to understand my end-users and better shape my services.