Is there an API for calculating shipments by Russian Post?

Question

CMS

I ran into the problem of calculating the delivery of a parcel of the specified size, weight and value in Russia.
The site www.pochta.ru has a calculator, but no information about the API for inserting such a calculator on the site.
There are several commercial proposals, but since mostly non-businessmen have gathered here, I ask this question.
Thank you.

Answer 1

Open the page, turn on the debugger, start filling out the form - and you will see requests for
https://pochta.ru/calculator/v1/api/delivery.time....
Obviously, this is it.
Parameters and return fields are looked at in the same debugger.

Answer 2

How to use this api?
I'm trying to send requests using requests and in response I get HTTP ERROR: 415
Unsupported Media Type