Your account will be charged for each request.
The cost can be calculated on the Pricing page.
Setting Live ‘Keywords For Keywords’ Tasks
Note that Google Ads Keywords Data API is based on the latest version of the Google Ads API that has replaced legacy Google AdWords API. If you’re using DataForSEO Google AdWords API, you need to upgrade to DataForSEO Google Ads API.
This endpoint will provide relevant keywords for the specified terms. Set up to 20 keywords in the keywords array and get keyword suggestions from Google Ads.
Note: you can send no more than 12 requests per minute per account using Google Ads Live endpoints.