Cashback shopping website GreasyPalm says it has delivered £5m in cash rebates for its users since it launched in 2003.
Users of GreasyPalm earn cash rewards on the purchases they make through the scheme's 850 participating retailers, including Marks & Spencer, Tesco, and Lloyds TSB.
GreasyPalm receives a CPA commission for every purchase made by its members - half of which is shared with customers. They receive a cheque once they have earned £25 or more.
The scheme is free to join, and the site has around 750,000 registered members.
Retailers benefit from the traffic that GreasyPalm sends to their sites - the cash rewards provide users with a strong incentive to make a purchase, and the company's research suggests that loyalty websites are delivering valuable traffic to online retailers.
The research claims earnings per click increased by over 300% for Comet while average order values went up 30%.
iPoints also operates an online rewards schemes in the UK, though it offers points and discounts rather than cashback.