GTA Online Generator
Yep, there are thousands of them. All on the first page of Google. They all look convincingly legit. You enter your username, choose your money and rank and click generate. Some magical lines of code appear on your screen and it seems like your dreams are coming true. You might actually be able to afford that yacht, or buy every super car in GTA Online. However every site then ask you to do a survey to "Prove your Identity".
All of these sites are fake sites, developed by scam artists to rob you of your time and in some extreme cases, your money. You will never receive RP and Money because there is no way to add money to a GTA Online account from your browser. It's impossible. It can't be done.
Please do not fall for any of these sites. They are all fake and just want you to do a survey.