eth_getCode

Returns the compiled bytecode at a given address. Returns "0x" for externally owned accounts (EOAs).

Tip

Flashblocks: call https://mainnet-preconf.base.org with "pending" to detect contract deployments before the block seals.

Parameters

Position	Name	Type	Description
1	address	string	The 20-byte address to query. Required.
2	block	string	Block number in hex, or "latest", "pending", "safe", "finalized", "earliest". Required.

Returns

Field	Type	Description
result	string	The bytecode at the address as a hex string. "0x" if there is no code.

Example

Request

Standard (latest)

curl https://mainnet.base.org \
  -X POST \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_getCode",
    "params": ["0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "latest"],
    "id": 1
  }'

Flashblocks (pending, ~200ms)

curl https://mainnet-preconf.base.org \
  -X POST \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_getCode",
    "params": ["0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "pending"],
    "id": 1
  }'

Response

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x608060405234801561001057600080fd5b50..."
}