Your short links never stop redirecting, even past your monthly click allowance. What changes is whether your affiliate tag is still included on the redirect.
Free plan
Free includes 500 clicks/month, plus a 100-click grace period (600 total) where your tag keeps working normally while we let you know you're close to the limit. Past 600 clicks in a month, we stop passing your affiliate tag through on new clicks — the visitor still reaches the destination, but that click won't earn you anything — until the next month starts, or until you upgrade.
Creator, Pro, and Business plans
These plans use extra "blocks" of 1,000 clicks once you go over your included allowance. If Smart Scaling is turned on, extra blocks are purchased automatically as needed, up to a monthly spending limit you control. If Smart Scaling is off, or you hit your spending limit, the same tag-stripping behavior as Free kicks in for any further clicks that month.
Either way: your links keep working, your visitors are never shown an error — the only thing that ever changes is whether that specific click earns you anything.