You really need to seek some professional legal advice on this - you are thinking of setting up a gambling website, and will need to be registered with and regu

You really need to seek some professional legal advice on this - you are thinking of setting up a gambling website, and will need to be registered with and regulated by the relevant authority. If you are pitching this as a "service", I believe you will need to offer free play. An example from the UK: Let's say a particular chocolate bar brand is running a competition where you can win a prize by finding a special code inside the chocolate wrapper. They are legally required to offer free entry for this to be classified as a competition (so you can write to them and ask for a free entry form - they have to comply). If you can only enter the "competition" by paying, it is considered gambling and regulated accordingly.