Wincher requests search volume data from Google Ads (Google Planner) using Google Ads API.
Even though search volume data is an SEO metric, Google doesn’t calculate it for search optimization specialists, but to help its advertisers choose the best keywords for their promotion.
Some of your keywords are missing search volume data because Google doesn’t let these keywords be promoted via Google Ads for various reasons, and therefore has no intention to calculate any data for them.
Should you wish to learn more about this subject, please check out our blog post on keyword search volume data and why some keywords are missing them.