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POST
eth_getCode
curl --request POST \
  --url https://monad-testnet.core.chainstack.com/9c5b265f20b3ea5df4f54f70eb74b800/ \
  --header 'Content-Type: application/json' \
  --data '
{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "eth_getCode",
  "params": [
    "0xAc586b65F3cd0627D2D05AdB8EF551C9d2D76E12",
    "latest"
  ]
}
'
{
  "jsonrpc": "<string>",
  "id": 123,
  "result": "<string>"
}
Monad API method that returns the code at a given address. This is used to check if an address is a smart contract and retrieve its bytecode.
When called against a block older than the latest ~128 blocks, this method is treated as an archive request (2 RUs instead of 1 RU). See request units.
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​
Parameters

  • data — the 20-byte address.
  • quantity or tag — integer block number, or the string latest, earliest, or pending.

​
Response

  • result — the code from the given address. Returns 0x for externally owned accounts (EOAs).

​
eth_getCode code examples

const { ethers } = require("ethers");

const provider = new ethers.JsonRpcProvider("CHAINSTACK_NODE_URL");

async function getCode() {
  const address = "0xAc586b65F3cd0627D2D05AdB8EF551C9d2D76E12";
  const code = await provider.getCode(address);

  if (code === "0x") {
    console.log("Address is an EOA (not a contract)");
  } else {
    console.log(`Contract bytecode: ${code}`);
  }
}

getCode();

​
Use case

A practical use case for eth_getCode is verifying whether an address is a smart contract before interacting with it, which helps prevent errors and potential security issues.

Body

application/json
​
id
integer
default:1
​
jsonrpc
string
default:2.0
​
method
string
default:eth_getCode
​
params
string[]

Response

200 - application/json

The bytecode at the given address.

​
jsonrpc
string
​
id
integer
​
result
string
Last modified on May 18, 2026