cost for using pabbly connect

I have created a workflow in pabbly connect wherein I collect payment information of successful payments from razorpay and add those payment details to google sheets. for each new payment on razorpay, a new row is added to spreadsheet with payment id, payment amount, email, name in separate columns of that row.
my confusion is whether such kind of tasks are forever free or there is some fees incurred after particular number of tasks are completed.