eth_getBalance
Returns the balance of the account of a given address.
Parameters
address: [Required] A string representing the address (20 bytes) to check for balance.block parameter: [Required] A hexadecimal block number, or one of the string tagslatest,earliest,pending,safe, orfinalized. See the default block parameter.
Returns
A hexadecimal of the current balance in the account at the given address. The balance is in wei.