You can filter unlimited WhatsApp numbers using WhatsApp Business API. The tool speed for filtration is 2-3 seconds for every 1000 numbers uploaded into the list. Channels are automatically rotated not to burden single channels with all the filteration load. The tool is super fast, and hence, you can filter millions of WhatsApp numbers in a single day!
You buy multiple 300$/country subscriptions of the different countries of your choice.