This is an example call for eth_blockNumber.
{
"jsonrpc": "2.0",
"id": "1",
"method": "eth_blockNumber",
"params": [
"latest"
]
}
{
"jsonrpc": "2.0",
"id": "1",
"error": {
"code": -32602,
"message": "too many arguments, want at most 0"
}
}