AccountCodes

Storage Map v210 → current

Maps EVM addresses to their deployed contract bytecode.

Queried by: developersanalytics

The Big Picture

Every deployed contract's bytecode is stored here. If an address has code, it's a contract; if not, it's an externally owned account (EOA). This is how the EVM knows what to execute.

Use Cases

Verify contract deployment
Distinguish contracts from EOAs
Build contract explorers
Debug contract interactions

Purpose & Usage

Purpose

Stores the executable code for each deployed smart contract.

Common Query Patterns

Query by H160 address
Check if address has code (is contract)

Query Keys

#	Name	Type	Description
1	key1	H160	key1 (H160)

Stored Value

Vec<u8> Vec

value (Vec<u8>)

Relationships

Modified By

create create2

Related Events

Created CreatedFailed Log

Code Examples

import { ApiPromise, WsProvider } from "@polkadot/api";
import { stringCamelCase } from "@polkadot/util";

const provider = new WsProvider("wss://entrypoint-finney.opentensor.ai:443");
const api = await ApiPromise.create({ provider });

// Query AccountCodes storage
const key1 = 0 as any /* H160 */;

const result = await api.query
  [stringCamelCase("EVM")]
  [stringCamelCase("AccountCodes")](
  key1
);

console.log("AccountCodes:", result.toHuman());

Runtime Info

Pallet: EVM
Storage Kind: Map
First Version: v210
Current Version: v393

Back to EVM Storage