eth_getCode

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "eth_getCode",
  "params": [
    "0xa0b86a33e6776e1e627e5c82df4c0cf77b8bb0c9",
    "latest"
  ]
}

{
  "id": 1,
  "jsonrpc": "2.0",
  "result": "0x608060405234801561001057600080fd5b50600436106100365760003560e01c..."
}

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "eth_getCode",
  "params": [
    "0xa0b86a33e6776e1e627e5c82df4c0cf77b8bb0c9",
    "latest"
  ]
}

{
  "id": 1,
  "jsonrpc": "2.0",
  "result": "0x608060405234801561001057600080fd5b50600436106100365760003560e01c..."
}

Returns the bytecode at a given address. This is useful for verifying if an address is a contract or an externally owned account.

Parameters

address

string

required

The address to get bytecode from (20 bytes).

blockParameter

string

required

Integer block number, or the string “latest”, “earliest” or “pending”.

result

string

The bytecode at the given address as a hexadecimal string. Returns “0x” for externally owned accounts.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "eth_getCode",
  "params": [
    "0xa0b86a33e6776e1e627e5c82df4c0cf77b8bb0c9",
    "latest"
  ]
}

{
  "id": 1,
  "jsonrpc": "2.0",
  "result": "0x608060405234801561001057600080fd5b50600436106100365760003560e01c..."
}

Code	Message	Description
-32602	Invalid address or block parameter	The provided address or block parameter is invalid
4100	Requested method not supported	The method is not supported by the wallet

If the result is “0x”, the address is an externally owned account (EOA). If it contains bytecode, it’s a smart contract.