Analyze Competitors service allows you to get keywords that a particular search engine associated with a given URL.
To retrieve the data, you can pass only 1 seed URL.
The API response can contain up to 700 keywords, and you will be able to see the monthly search volume, cost-per-click, and Google Ads competition metrics for the keywords.
To get the data using Analyze Competitors service you will need to make API requests to the Analyze Competitors Endpoint
You can find the detailed API reference and the list of supported parameters for the Search Volume endpoint on this page: https://docs.keywordtool.io/v2/reference