eth_getBalance

Returns the balance of the account of given address.

Parameters
  1. DATA, 20 Bytes - address to check for balance.
  2. QUANTITY|TAG - integer block number, or the string "latest", "earliest" or "pending", see the default block parameter
Example Parameters
params: [
   '0xc94770007dda54cF92009BFF0dE90c06F603a09f',
   'latest'
]
Returns

QUANTITY - integer of the current balance in wei.

Example
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getBalance","params":["0xc94770007dda54cF92009BFF0dE90c06F603a09f", "latest"],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x0234c8a3397aab58" // 158972490234375000
}