on 22.12.20 I got email from yandex.webmaster 
from January 27:0 query. i try find hour limit for 24 hour then i got
<time-interval from="2021-02-01 20:00:00 +0000" to="2021-02-01 21:00:00 +0000">0</time-interval>
0 value, i can't use a single query in every hour. Is xml.yandex.com shut down?
You need to add your websites to https://webmaster.yandex.ru/ and for each website you have some number of requests.