Add endpoint to fetch total usage of the day

[alicanyuksel]

Hi there,

Are you considering adding an endpoint in your API in the future so that the client can fetch the total usage for the day? Because as you know, more and more, we're integrating LLMs into our tools. It could be interesting to monitor costs without having to go to our MistralAI account. What do you think? :)

Here is an example from OpenAI for this particular use case:

r = openai.api_requestor.APIRequestor();
resp = r.request("GET", '/usage?date=2024-02-07'); // or start_date and end_date