You can! Here are the instructions for setting up reCaptcha in Ontraport:
reCAPTCHA uses a single mouse click to confirm the visitor to the page is not an automated "bot" and helps prevent spam submissions. You can add reCAPTCHA to your legacy Smart Forms, ONTRAforms, and Smart Form blocks in ONTRApages.
Go to Google reCAPTCHA and click the Get reCAPTCHA button at the upper right. Name the integration in the Label field. You will use a single reCAPTCHA configuration for all the forms in ONTRAPORT.
Select reCAPTCHA V2 in the Register a new site dialog box. The dialog box will expand to allow you to enter all of the domains you will use reCAPTCHA on. In addition to your own domains add these ONTRAPORT domains if you plan to use them for ONTRApages:
You can return to add additional domains later.
Check the box next to Accept the reCAPTCHA Terms of Service and Send alerts to owners, and click Register.
Copy the Site Key and Secret Key to a text file for use later in ONTRAPORT.Adding Your reCAPTCHA Keys to ONTRAPORT
In ONTRAPORT, click the profile icon at the top right and select Administration. Click on the Security tab and the reCAPTCHA Settings.
Enter the Site Key and Secret Key numbers from reCAPTCHA in the appropriate spots, and click Save.