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POST
/
evm
ots_hasCode
curl --request POST \
  --url https://hyperliquid-mainnet.core.chainstack.com/4f8d8f4040bdacd1577bff8058438274/evm \
  --header 'Content-Type: application/json' \
  --data '
{
  "jsonrpc": "2.0",
  "method": "ots_hasCode",
  "params": [
    "0x5555555555555555555555555555555555555555",
    "latest"
  ],
  "id": 1
}
'
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": true
}
The ots_hasCode JSON-RPC method checks whether a specified address contains deployed contract code on the Hyperliquid EVM blockchain. This Otterscan-specific method provides a quick way to determine if an address is a smart contract or an externally owned account (EOA).
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​
Parameters

  1. address (string, required): The address to check for deployed code
  2. block identifier (string, optional): The block at which to check the code
    • Can be a block number, block hash, or one of: "earliest", "latest", "pending"
    • Defaults to "latest"

​
Response

The method returns a boolean value indicating whether the address contains code.

​
Response structure

  • true — the address contains deployed contract code
  • false — the address is an EOA or does not exist

​
Usage example

Shell
curl -X POST https://hyperliquid-mainnet.core.chainstack.com/4f8d8f4040bdacd1577bff8058438274/evm \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "ots_hasCode",
    "params": ["0x5555555555555555555555555555555555555555", "latest"],
    "id": 1
  }'

​
Example response

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": true
}

​
Check at specific block

Shell
curl -X POST https://hyperliquid-mainnet.core.chainstack.com/4f8d8f4040bdacd1577bff8058438274/evm \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "ots_hasCode",
    "params": ["0x5555555555555555555555555555555555555555", "0x1000"],
    "id": 1
  }'

​
Use cases

The ots_hasCode method is essential for:
  • Address classification: Quickly determine if an address is a contract or EOA
  • Transaction validation: Check if transaction targets are contracts before sending
  • Security checks: Verify addresses before interacting with them
  • UI differentiation: Display different interfaces for contracts vs EOAs
  • Gas estimation: Optimize gas estimates based on target address type
  • Contract verification: Confirm successful contract deployment
  • Historical analysis: Check when contracts were deployed by testing different blocks
  • Wallet integration: Warn users when sending to contracts vs regular addresses
  • Smart contract interaction: Pre-validate addresses before calling contract methods
  • Block explorer optimization: Efficiently categorize addresses without fetching full code
This method provides a lightweight alternative to eth_getCode when you only need to know if code exists, not the actual bytecode itself.

Body

application/json
​
jsonrpc
enum<string>
default:2.0
required

JSON-RPC version

Available options:
2.0
​
method
enum<string>
default:ots_hasCode
required

The RPC method name

Available options:
ots_hasCode
​
params
array
required

Parameters: [address, block identifier (optional)]

​
id
integer
default:1
required

Request identifier

Response

200 - application/json

Successful response indicating if address has code

​
jsonrpc
string

JSON-RPC version

​
id
integer

Request identifier

​
result
boolean

True if address has code, false otherwise

Last modified on October 19, 2025