https://www.bigdomaindata.com/bulk-whois-api/
Bulk WHOIS API - WHOIS of 10,000 Domains at Once
Bulk WHOIS API lets you fetch parsed WHOIS data in JSON or XML of up to 10,000 domain name via a single API query. Get all results within 10 seconds!
bulk whois apiat oncedomains
https://whois.whoisxmlapi.com/bulk-api
Bulk WHOIS API | Easy Access to Bulk WHOIS Data | WhoisXML API
Get access to bulk whois data for a list of domains or IP addresses via a single RESTful API query. Sign up to get free 500 monthly credits.
bulk whois apiaccess to dataeasy