Nope -- you never have to worry about missing out on any new leads. As long as you have a credit card on file, your keywords will continue to work and capture email addresses as normal.
- Add credits to your account to resolve your negative credit balance before the end of your billing cycle to avoid being charged a fee for each overage credit used (starting at 6 cents per credit).
If you don't have a credit card on file, your keywords will be deactivated when you run out of credits and will stop collecting information.