Your account will be charged for each request.
The cost can be calculated on the Pricing page.
Setting Live ‘Keywords For Site’ 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 you with a list of keywords relevant to the specified domain along with their bids, search volumes for the last month, search volume trends for the last year (for estimating search volume dynamics), and competition levels.
Note: you can send no more than 12 requests per minute per account using Google Ads Live endpoints.