Revolut, which has around 25m customers worldwide, is rolling out the service this week to customers in the U.K. and European Economic Area (EEA). At first, the London-based fintech company will support staking of the tokens of Polkadot (DOT), Tezos (XTZ), Cardano (ADA) and Ethereum (ETH). Yields on the assets reach up to 11.65%, though these are variable.