How Do I Get an API Key for Yandex.Maps?
Yandex has updated its maps usage policy. Now, in order to add a map to your website, you need to get an API key and specify it in the settings of the Map widget.
To receive the key, go to Yandex Developer Dashboard and click on Connect API.
All uKit sites meet the requirements for free use of the Yandex.Maps API, (the terms can be viewed here) so you should select Yes when answering this question:
At the final step, make up a name for your API key.
The API key will display on the next page:
Copy the key created by Yandex, open uKit in the Builder mode, choose Yandex in the settings of the Map widget and paste the key to the API Key box.
Yandex.Maps is now successfully enabled for your site.