I m built version 1 of Sydes-test, an open-source CLI that reads backend code repo of your REST API(s) and generates its contracts, test cases converting to Postman collections. You can directly import those postman collection and run according to your hosted API location. When API code changes, you can rerun just one command for the affected API and generate new testcases.
The idea came from a simple problem: for an existing API, the contract is usually scattered across routes, handlers, validators, models, and response logic.