What are the APIs/Services for advanced search for tours/tickets/hotels?

Question

API

There are quite a few aggregators for searching for flights, hotels, car rentals, etc.
But are there any aggregators, or services with advanced search, or those who provide an extended API?
This is necessary to solve such issues:
I want to go, for example, to country A. The
exact dates are not important for me, but I know that I want to go in the winter and spend 1-2 months there.
I am ready to fly with a transfer, but if so, then it is desirable that the transfer is not 1-5 hours in advance, but with a stop for 1-2 days, so that you can see a new city / country. If the transfer is where I have already been, I want to transfer without spending the night, as soon as possible. In case of a long transfer, it is not necessary to buy tickets as a set.
It's great if there is information about the workload of hotels, etc. at the same time.
I want to visit several countries, cities,
there is about as much time for this,
I want to stay in each place from a week to a month
. Offer me the best flight options.
The best - it's cheaper, direct
And other similar Wishlist.
Of the publicly available aggregators, I have never seen anything like this.
In the case of complex routes, it usually suggests choosing strict dates and that's it.

Answer 1

https://habrahabr.ru/post/323094/