JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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It means that you can receive up to 10 payments on your forms in your account per month while still being able to use them for free. Once you use up all 10 of them, your account is given a grace period to upgrade before it is disabled.
Your account is then re-activated automatically either when you upgrade to a paid plan or on the first of any month and you can receive 10 more payments for that month again :)
Do let us know if you have any further questions and we would be happy to answer them :)