Hi
We are a bunch of designers and developers who have good experience of 4+ years.
From your brief we noticed that you just need data to be displayed in very minimalist and good looking manner. However, we are still not sure on the amount of work and skill set you are looking for this project. If you could provide more details over messaging like you mentioned. We would be able to provide exact Time and Cost required to complete this project.
Also, if you need more help later with the actual API or Design we can assist you with QA, Performance Optimization, Bug fixing, Enhancement etc. that results in creating more trust among your audience.
We would be great if you invite us for Private chat to discuss further.
Thanks
Ezinagro Team