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Domain Analytics Whois API will provide you with Whois records and essential SERP data on millions of domains across the web.
Domain Analytics Whois API is based on DataForSEO’s proprietary database and therefore natively supports the Live mode of data processing.
Using this API, your account will be billed for both setting a task and retrieving its results.
See docs
*Price Calculation
The number of domains you can get in a single response is limited to 1,000, so you will have to make 1,000 requests in order to obtain 1M domains and related data.
Given that the price for setting a task is $0.1 and the price per each item is $0.001, the price for 1M domains is calculated as follows:
1,000*0.1 + 1,000,000*0.001 = $1,100