At the moment, requests that go beyond plan limits will fail and you'll get a 429 error code with error message. You will not be automatically charged for additional usage. 

LocationIQ team is working on a soft limit that'll allow you to go over the plan limits upto an extent. Until then, we can add bonus credits that'll act as buffer. If you need this buffer, Please reach out to us at or via our contact page.

If none of these options work, reach out to us with your requirements and we'll figure out a custom plan for you. :)