eth_estimateGas

interface TransactionParams {
  from?: string; // The address the transaction is sent from
  to?: string; // The address the transaction is directed to
  gas?: string; // Hexadecimal string of the gas provided for the transaction execution
  gasPrice?: string; // Hexadecimal string of the gasPrice used for each paid gas
  value?: string; // Hexadecimal string of the value sent with this transaction
  data?: string; // The compiled code of a contract or the hash of the invoked method signature and encoded parameters
}