According to the Staking Rewards USD value locked in staking is around 146.5 billion USD, while the Staking Market Cap (valuation of all projects that have staking mechanism) is currently at 633.5 billion USD.
We have prepared the list of projects sorted by the USD value of the staked tokens. According to the list, top 5: Solana, Cardano, Ethereum, Polkadot, and Avalanche.
We calculated the ratio of staked coins to the circulating supply as well. The leaders are Mina Protocol (92.8%), Persistence (83.7%), Akash (82.5%), Band Protocol (79.9%), and Waves (79.8%).