Amazon itself doesn't openly and publicly provide data related to Keywords search volumes. The sole similar data it shares is associated with the Impressions an advertiser gets using Sponsored Product Ads on Amazon, which are highly dependent on the bid.
Our Keywords Search Volume estimates are pulled from Google's widely-trusted data around the monthly search queries done in its search engine. Given that, nowadays, customers start their online purchase journey directly within Amazon, and that this data is used similarly across all tracked Keywords on DataHawk, we believe it to be a very strong estimate and proxy of search volume and of a Keyword's importance.
Once you start tracking a new Keyword, we will fetch its search volume data after a maximum of 24 hours. We update search volumes on a monthly basis.