The most common option right now is tools like WA Blast - a browser-based sender that works via WhatsApp Web, lets you connect multiple numbers and send bulk messages without API approval.
However, all such tools are unofficial, meaning they violate WhatsApp policies and carry a high risk of number bans, especially when scaling or using multiple accounts.
If your goal is to warm up 10 numbers + AI automation + mass sending, what you’re describing is exactly the type of setup that gets flagged quickly.
Professional answer: use no-API tools only for short-term testing or gray projects - for anything serious, switch to official API platforms with automation, otherwise you’ll lose accounts sooner than you scale.