Where is it more convenient to implement a task with audio files, API and text?

Question

Do it yourself

It has long been an idea to voice books and articles. Recently I found this: https://tech.yandex.ru/speechkit/cloud/
After playing around, I found a limit on the volume of a one-time transfer.
And so , how to organize a simple transfer, text splitting and sending, followed by receiving and gluing wav pieces and, in the future, automatic playback.