Common RPC calls on ETH
Get balance
{ "jsonrpc": "2.0", "id": 1, "method": "eth_getBalance", "params": ["0xaeaa570b50ad00377ff8add27c50a7667c8f1811", "latest"]}
Get latest block
{ "jsonrpc": "2.0", "id": 1, "method": "eth_blockNumber"}
Get block by number
{ "jsonrpc": "2.0", "id": 1, "method": "eth_getBlockByNumber", "params": ["0x1396d66", true]}