Re prior art, there are some solutions like this in the Clojure world, given the data-centricity of the language. See Hyperfiddle: http://www.hyperfiddle.net/

Re prior art, there are some solutions like this in the Clojure world, given the data-centricity of the language. See Hyperfiddle: http://www.hyperfiddle.net/ http://www.hyperfiddle.net/ And also Vase: https://github.com/cognitect-labs/vase https://github.com/cognitect-labs/vase This is also similar to API mocking services. Agree with other comments, it is important to find a customer. Good luck!