Upvote Guardian

Stops automated raids by making new members fill out a captcha to verify that they are not a robot - alt detection and anti raid

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Guardian Bot

The one stop shop to the safest server in the wild west
Guardian captchas make it as easy as pie to secure your server from automated attacks from malicious attackers, of course while maintaining our users privacy.

Setup process

Invite the bot
Run the /setup command. To automatically configure settings - (The bot does its best to automatically configure the channels that unverified users can access, this may require some tweaking on your behalf so make sure to check that they are setup properly.)
Sit back and relax as you no longer need to worry about server raids!

Check out the home page for the full Discord Bot List.