US-registered securities firm Prometheum has announced the opening of its custody business to institutional clients, marking a deeper penetration into the cryptocurrency market by the company. With growing demand, Prometheum plans to roll out trading and settlement services in the future to cater to the increasingly diversified needs of institutional clients. Currently, Prometheum's custody service covers six types of digital assets including Ethereum (ETH), Uniswap (UNI), Arbitrum (ARB), and has added Optimism (OP) and The Graph (GRT) tokens as new supported objects, aiming to provide clients with more comprehensive and flexible asset management solutions.