Clearing House Automated Payment System Definition – The Clearing House Automated Payment System, commonly referred to as CHAPS, is the real-time gross settlement, or RTGS, system used in the United Kingdom for daily clearings of Sterling and foreign currency. CHAPS is also an electronic bank-to-bank same-day value payment made within the UK in sterling. The main benefit of CHAPS is that it is fast, secure and efficient and the money is transferred the same day. Unlike other forms of payment such as checks, CHAPS payments are irrevocable. CHAPS is one of the largest RTGS systems in the world. Banks themselves use CHAPS to move money around the financial system, but it is also used regularly for business-to-business payments, by solicitors and licensed agents to transfer the purchase price of a house between the bank accounts of those involved, and by individuals buying or selling a high-value item, such as a car, who need a secure, urgent, same-day guaranteed payment.