API Testing - Most wanted featured for API Tests?

Hi! My name is Vladut, and I have a question. I and my friend are working on an SaaS for API Testing. The platform's called API Unit, if you wanna visit or register for your newsletter, you can do it here https://apiunit.io . We are working on a few features, but we can't decide which one is the most important for our first release. Chained API—it's a nice feature because it allows you to use the response from an endpoint to send another request to another endpoint using the response from the previous endpoint as input data in the next request. Load testing on a specific endpoint - this means that instead of running multiple requests manually, you need to set on our dashboard requests per minute / second and let us know how many requests you need. After a test run, we will return avg. response time, size, tests duration and many other metrics about your endpoint.