SERP API provides the Top-100 SERP results for a keyword. The results are specific to the selected search engine (see the List of Search Engines) and location (see the List of Locations) settings.
There are two different methods you can use to retrieve data: Scheduled and Live.
The operating principle of Scheduled SERP API doesn’t return result at once but instead provides a list of unique ids that are unique and assigned to each separate task. You can then use the unique id to return its results.
Live SERP API allows you to get data immediately after the task is completed without making a separate request. This is useful if your app’s functionality implies real-time data.