Hi Herman,
Yes, it does increase the price.
Actually such custom public forms option is only provided in Usage-based licenses, which start at $400 per month.
In this option, you will get $400 credit and as requests are sent from the public form, your credit will decrease by small amount.
And when you have used up your credit, you can stop or agree to be billed for any over usage.
If the starting price of $400 per month sounds reasonable, we can discuss more detail in how much transactions you anticipate and provide you with an estimate.
Would you like our business team to contact you?
Best regards,
Taka