Plugin for YOURLS: Google Safe Browsing

What for

Check every new URL against Google's Safe Browsing Lookup service, reject those who are identified as malware or phishing

How to

In /user/plugins, create a new folder named google-safe-browsing
Drop these files in that directory
Go to the Plugins administration page and activate the plugin
Follow on-screen instructions
Have fun

Disclaimer

Using this plugin requires you to understand Google Safe Browsing usage. In short:

you need a Google account, to create project, create and activate a Google API key - not a 30 second task,
you are limited to a certain amount of queries per day,
you must understand that the service is not perfect.