Try Oneclicksender
https://www.oneclicksender.com/

Great question!

So community member Danni has build the example code for this:
https://github.com/Gusarich/ton-mass-sender/tree/main

Try @HuilityBot

our docs: https://bolt-foundation.gitbook.io/bolt-ecosystem-eng/huility-docs/about-the-service