Estimated rewards is the percentage of annual rewards you are predicted to receive, subject to change, based on a provider’s performance over the last week, as calculated by each provider's API. To learn more about estimated rewards, see here.
Network control is the estimated percentage of staking validators associated with each provider, calculated using a mix of on-chain data and third-party APIs.
Popularity is an estimate of the fiat value of ETH and MATIC staked with each provider. This is calculated using the same method of available on-chain data and third-party APIs.
